钢铁研究学报(英文版)
首页
期刊介绍
编 委 会
投稿指南
期刊订阅
广告服务
留言板
联系我们
English
在线办公平台
在线期刊
当期目录
论文检索
过刊浏览
论文下载排行
论文点击排行
Email Alert
文章快速检索
高级检索
2018年 25卷 12期
刊出日期：2018-12-15
1213
Run-sheng Xu, . Wei Wang, . Bo-wen Dai,
Influence of particle size on combustion behavior of bamboo char used for blast furnace injection
The combustion behavior of bamboo char and its relationship with particle sizes were evaluated using thermo-gravimetric analysis. The results showed that the combustion properties of bamboo char were much better than those of the anthracite used as a coal injected for blast furnace ironmaking due to its porous structure, disordered microcrystalline and higher catalytic index of ash minerals. When the particle size increased from - 0.074 to 0.500–1.000 mm, the ignition temperature and burnout temperature of bamboo char increased, while the combustible index and comprehensive combustion characteristic index decreased slightly. The apparent activation energies of non-isothermal combustion of bamboo char and anthracite were calculated based on the distributed activation energy model. The results showed that the average activation energy was 162.86 kJ/mol for - 0.074 mm anthracite, while it ranged from 71.01 to 89.44 kJ/mol for bamboo chars of different sizes. It revealed that the combustion reactivity of bamboo char in the largest size (0.500–1.000 mm) was much better than that of - 0.074 mm anthracite; thus, the size of biomass char could be enlarged to the maximum size specified by the injection application of blast furnace.
2018 Vol. 25 (12): 1213-1222 [
摘要
] (
94
) [
HTML
1KB] [
PDF
0KB] (
191
)
1223
Ya-ting Tang . Man-sheng Chu . Jue Tang . Li-hua Gao . Zheng-gen Liu
Oxidation mechanism and non-isothermal kinetic studies on carbonate iron ore by thermogravimetric analysis
Due to the uncertain and heterogeneous compositions of carbonate iron ore after magnetization roasting, an oxidation pretreatment was applied to increase the uniformity of the composition of the ore. The oxidation of carbonate iron ore was characterized using a thermogravimetric method over a temperature range of 723–948 K. It is shown that the oxidation process of carbonate iron ore is complicated and consists of multiple reactions that include the decomposition and oxidation of carbonates such as FeCO3, MnCO3, MgCO3 and CaMg(CO3)2. The main product that results from oxidation is Fe2O3. Because of the low content of other carbonates (MnCO3, MgCO3 and CaMg(CO3)2) in raw carbonate iron ore and the small change in the apparent activation energies during oxidation, the oxidation of carbonate iron ore can be treated as a single-step FeCO3 oxidation reaction. Based on the Ozawa–Flynn–Wall method, which is one of the model-free methods, the apparent activation energy for the oxidation of carbonate iron ore is 284.50 kJ mol-1. The most probable reaction model for the oxidation of carbonate iron ore is the S ˇ esta′k–Berggren model as determined by the theoretical and actual master plot and eigenvalues of the Ma′lek method. The reaction orders n and m are 1.317 and 0.0295, respectively. The preexponential factor is 2.628 9 1017 min-1.
2018 Vol. 25 (12): 1223-1231 [
摘要
] (
67
) [
HTML
1KB] [
PDF
0KB] (
134
)
1232
Feng Chen. Yu-feng Guo . Tao Jiang . Shuai Wang . Fu-qiang Zheng
Development and mechanism analysis of a highly efficient binder in pelletizing of ilmenite used in electric furnace
The development and mechanism of a highly efficient binder in pelletizing of ilmenite from Panzhihua, China, were investigated. It shows that both the drop strength of green pellets and compressive strength of dried pellets were improved when using the mixtures of starch, NaOH and sodium silicate as the adhesive. Adhesive film was formed on the surface of particles as the function of sodium silicate, promoting the filling of gelatinized starch between the adhesive films to bond the particle tightly. The drop strength of green pellet was 1.3 times/(pellet 700 mm), and the compressive strength of dried pellet of 250 °C was 1825 N/pellets when 0.5 wt% NaOH, 1.0 wt% sodium silicate and 2.0 wt% starch were added as adhesive.
2018 Vol. 25 (12): 1232-1236 [
摘要
] (
49
) [
HTML
1KB] [
PDF
0KB] (
163
)
1237
Hua-wei Zhang . Jia-lu Wu . Xin-gang Wang
Crack defect of tailor rolled blank in deep drawing process
The deformation process of tailor rolled blank (TRB) is different from that of a monolithic blank as a result of the variable thickness in the rolling direction, and thus, the mechanism of the crack phenomenon needs to be further studied. The crack defect of TRB square box was studied by numerical simulation and stamping experiment. The stress state of TRB square box was elaborated. On this basis, the forming characteristics of TRB square box were summarized. The effects of blank size and blank holder force (BHF) on the thickness thinning of TRB were discussed. Finally, the mechanism of the crack defect for TRB square box was revealed. Results indicate that non-uniformity is the most prominent characteristic during forming of TRB square box. The larger the blank size and BHF on the thinner side are, the more inclined TRB is to crack. Excessive BHF or insufficient BHF on the thicker side can also lead to the occurrence of the crack defect. BHF on the thinner side slightly greater than that on the thicker side (40 kN on the thinner side and 20 kN on the thicker side) is advantageous to restrict the excessive thickness thinning of TRB and acquire a better formability. The location inclined to crack for TRB square box is the round corner of the wall on the thinner side.
2018 Vol. 25 (12): 1237-1243 [
摘要
] (
35
) [
HTML
1KB] [
PDF
0KB] (
157
)
1244
Jun Hu . Lin-xiu Du . Bin Zhang . Xiang-yu Qi . Xiu-hua Gao . R.D.K. Misra
Structure–property relationships in heat-affected zone of gas-shielded arc-welded V–N microalloyed steel
The structure–property relationship in heat-affected zone (HAZ) of a low-carbon steel bearing V–N subjected to gasshielded arc welding was explored. The microstructural characteristics of base metal (BM), coarse-grained HAZ (CGHAZ), fine-grained HAZ, and intercritical HAZ were significantly different. The effect of grain-refinement strengthening and transformation hardening on HAZ contributed to equivalent hardness of 260.8–278.5 HV in comparison with BM hardness of 272.0 HV. Moreover, excellent impact toughness at - 20 °C was obtained because of high resistance to crack propagation by high-misorientation boundaries, leading to impact fracture consisting of dimples. In CGHAZ, free N was partly fixed by V(C, N) precipitates, such that the deterioration effect of N on toughness was considered to be nearly eliminated. In comparison with CGHAZ, weld metal contained higher fraction of acicular ferrite with fine plates, while the impact toughness was inferior because of the detrimental influence of coarse inclusions from the welding wire. The nanoscale V(C, N) precipitates in CGHAZ had weak effect on toughness because of small size.
2018 Vol. 25 (12): 1244-1254 [
摘要
] (
55
) [
HTML
1KB] [
PDF
0KB] (
163
)
1255
Yang-huan Zhang, . Kai-feng Zhang, . Ze-ming Yuan, . Ya-qin Li . Hong-wei Shang . Yan Qi . Xiao-ping Dong . Dong-liang Zhao
Improved hydrogen storage performance of as-milled Sm–Mg–Ni alloy by adding CeO2
To investigate the influence of adding CeO2 on the hydrogen storage characteristics of Sm–Mg–Ni-based SmMg11Ni-type alloy, mechanical milling was utilized to synthesize SmMg11Ni and SmMg11Ni ? 5 wt.% CeO2 (named SmMg11Ni– 5CeO2) alloys. The microstructure of as-cast and as-milled samples was measured via X-ray diffractometer and transmission electron microscope. Sieverts device was utilized to measure the isothermal hydriding and dehydriding kinetics. The non-isothermal dehydrogenation performance was explored by thermogravimetry and differential scanning calorimetry. The hydrogen desorption activation energy of the compound metal hydride can be computed by both Arrhenius and Kissinger methods. The related data show that adding CeO2 can engender a very slight influence on the hydrogen storage thermodynamics, but it can result in an obvious reduction in hydrogen absorption and desorption capacities. Furthermore, the hydrogen desorption performance of experimental alloys is conspicuously ameliorated by the addition of CeO2, viz. lowering the initial hydrogen desorption temperature and enhancing hydrogen desorption rate. The hydrogen desorption activation energies with and without CeO2 addition are 84.28 and 100.31 kJ/mol, respectively, with an obvious decrease of 16.03 kJ/mol. This is thought to be responsible for the ameliorated hydrogen desorption kinetics by adding CeO2.
2018 Vol. 25 (12): 1255-1264 [
摘要
] (
73
) [
HTML
1KB] [
PDF
0KB] (
144
)
1265
Lei Zhang,, . Cun-yu Wang . Heng-chang Lu . Wen-quan Cao . Chang Wang . Han Dong . Leng Chen
Austenite transformation and work hardening of medium manganese steel
The austenite transformation behavior and mechanical properties of medium manganese steel subjected to tensile strain were studied by electron backscatter diffraction, X-ray diffraction and tensile tests. The results show that the austenite phases are mainly distributed on the grain boundary in the duplex microstructure of austenite and ferrite, and it is easy for the big-size austenite to transform at small beginning tension strain following the mechanisms of both austenite (fcc) → ε-martensite (hcp) → α-martensite (bcc) and austenite (fcc) → α-martensite (bcc). Both yield strength and tensile strength increase with the increase in pre-strain, and the total elongation decreases, while the value of pre-strain plus total elongation almost keeps constant. During tensile deformation, transformation from austenite into martensite improves work-hardening rate remarkably.
2018 Vol. 25 (12): 1265-1269 [
摘要
] (
49
) [
HTML
1KB] [
PDF
0KB] (
155
)
1270
Shao-ning Jiang . Li-qun Xu . Fa-rong Wan
Effect of precipitates on high-temperature strength and irradiation behavior of vanadium-based alloys
The formation of precipitates and their effect on mechanical properties and irradiation damage in V–4Cr–4Ti alloys have been investigated using transmission electron microscope, high-temperature tensile tests and high-voltage electron microscope (HVEM). V–4Cr–4Ti alloys were aged for 20–40 h at 873 K, and extremely fine precipitates were produced during the aging process, which coarsened with aging time. The results of high-temperature (773, 873 and 973 K) tensile tests showed an increase in strength with increasing aging time (i.e., increasing size of precipitates) while a decrease in the uniform elongation. There was evidence that presence of precipitates strengthened V–4Cr–4Ti alloys. In situ HVEM observations showed that the precipitates restricted the growth rate of dislocation loops induced during electron irradiation at 773 K. The interactions between precipitates and irradiation-induced dislocation loops were discussed. The presence of particles alleviated the increase in irradiation hardening up to an irradiation dose of 3.42 dpa (displacement per atom). The precipitates shrank in size during electron irradiation, which was due to the dissolution of constituent atoms of the precipitates into the alloy matrix.
2018 Vol. 25 (12): 1270-1277 [
摘要
] (
66
) [
HTML
1KB] [
PDF
0KB] (
168
)
1278
Chun-peng Liu . Xiu-juan Zhao, . Peng-tao Liu . Chong Xu . Rui-ming Ren,
Influence of slip ratio on worn-surface microstructure and fatigue wear behavior of D2 wheel steel
To investigate the worn-surface microstructure and fatigue cracks in D2 wheel steel under the pure rolling and 0.5% slip ratio conditions, a rolling wear test using a GPM-40 wear machine to simulate the wheel/rail operation was performed. After testing, a transmission electron microscope, a scanning electron microscope with electron backscatter diffraction, and micro-hardness testers were used to characterize the microstructure and fatigue cracks. The surface microstructure and hardness of the pure rolling sample were in a steady state after 8 × 104 cycles; however, the 0.5% slip ratio sample reached a steady state after 7 × 103 cycles. Regardless of whether the test uses the slip ratio, the orientation of lamellar pearlites gradually became parallel to the surface and a portion of lamellar cementites was fragmented and dissolved during the formation of steady-state microstructure. The slip ratio accelerates this process. The hardening mechanism of the samples shows a decrease in the lamellar spacing of pearlite and the refinement of proeutectoid ferrite (PF). As the number of cycles increased, plastic deformation of samples became increasingly severe and the wear mechanism of the samples was fatigue wear in steady state. The sample surfaces formed shallow cracks, which gradually peeled off. The slip ratio accelerated the initiation and propagation of fatigue cracks because of the high friction stress on the contact surface. Most fatigue cracks initiated at the interface of pearlite and PF and in the PF region.
2018 Vol. 25 (12): 1278-1286 [
摘要
] (
46
) [
HTML
1KB] [
PDF
0KB] (
143
)
1287
Xi-liang Zhang . Hua-feng Hou . Tao Liu . Qian Zhou . Hong-ji Liu . Yu-long Zhang . Hao-xuan Cui . Zheng Lv
Effect of annealing time and phosphorus addition on bake hardening behavior of ultra-low carbon bake hardening steel
The relationship of the P and C grain boundary segregation and its effect on bake hardening behavior were investigated in ultra-low carbon bake hardening (ULC-BH) steel with and without P addition annealed at 810 °C for various time using electron probe micro-analyzer, electron backscattered diffraction, and three-dimensional atomic probe techniques. Results revealed that P addition and annealing duration considerably affected the bake hardening behavior of experimental steel. The BH value of ULC-BH steel without P addition is lower than that with P addition within a short annealing time, and the difference in the BH value gradually decreases as the annealing duration is prolonged. P segregation is dominant in terms of a high P bulk content in steels with P addition at the expense of C segregation during annealing. By contrast, opposite effects are observed in low carbon bake hardening steel. The high residual solute C content in steel with P addition is due to P segregation at the grain boundary. Site competition is mainly responsible for the lower BH value in ULC-BH steel without P addition than that with P addition. As the annealing time is further extended, C segregation begins at grain boundary despite the delayed P segregation, leading to a gradual decrease in the solute concentration in the matrix of steels with P addition. C and P segregations reach the equilibrium as the annealing time increases to 60 min at 810 °C in the two steel samples. Theoretical calculations reveal that the residual solute C concentration in the matrix decreases to zero, and this finding is consistent with the change trend of the bake hardening value. Hence, the C segregation at grain boundary adversely influences the bake hardening property of ULC-BH steel.
2018 Vol. 25 (12): 1287-1295 [
摘要
] (
83
) [
HTML
1KB] [
PDF
0KB] (
168
)
1296
Xiao-fei Zheng, . Yong-lin Kang . Bao-yong Wang . Zhi-gang Han . Xin-long Luo
Flexible manufacturing technology of controlling exact bake hardening value in continuous galvanizing line
Flexible manufacturing technology for ultra-low-carbon bake hardening (BH) steels with different solute carbon contents in the range of (6–16) × 10-4 wt.% was systematically studied. The effects of soaking temperature, cooling rate and aging time on solute carbon content were explored. The bake hardening value in a continuous galvanizing line with an over-aging section was investigated. Optimal manufacturing parameters were calculated using the design of experiment to obtain the best and most flexible process parameters. Results indicate a relationship among carbon content, soaking temperature and cooling rate. When solute carbon is 9 × 10-6, cooling rate is 50 °C/s, the soaking temperature is 745 °C, and BH value is 45 MPa, the requirements of an automobile factory can be met.
2018 Vol. 25 (12): 1296-1302 [
摘要
] (
76
) [
HTML
1KB] [
PDF
0KB] (
158
)
1303
Fa-cai Ren . He Wang . Xiao-ying Tang . Fei Chen
Creep rupture behavior and microstructural evolution of modified 9Cr–1Mo heat-resistant steel
High-temperature creep rupture behavior of modified 9Cr–1Mo steel used for steam cooler was investigated at temperature of 838 and 923 K and stress ranging from 100 to 250 MPa. Based on the analysis of creep rate–time curves, it is found that the creep rupture life decreases with the increase in the applied stress and temperature. The creep damage tolerance factor has been identified as a value of 8. In the normalized and tempered condition, the studied steel shows typical martensitic microstructure with Cr-rich M23C6 and Nb- or V-rich MX precipitates. Moreover, the Laves phase has been found along the grain boundaries. The fracture morphology characterized by field emission scanning electron microscope is adopted to reveal the creep failure mechanisms. The investigated results indicate the occurrence of the transgranular fracture under all the creep test conditions.
2018 Vol. 25 (12): 1303-1307 [
摘要
] (
54
) [
HTML
1KB] [
PDF
0KB] (
161
)
钢铁研究学报(英文版)
编辑部公告
·
《钢铁研究学报》第二届青年编委招募
·
《钢铁研究学报》英文版“极端环境下材料的腐蚀和磨损”专刊征稿启事
·
《钢铁研究学报》英文版“钢铁冶金固废资源化利用”专刊征稿启事
·
《钢铁研究学报》英文版“多相多尺度冶金过程数值仿真”专刊征稿启事
·
《钢铁研究学报》英文版“人工智能在钢铁冶金及材料中的应用”专刊征稿启事
更多
作者指南
投稿须知
论文模板
标准规范
版权协议
读者会员登录
友 情 链 接
更多
版权所有 © 《钢铁研究学报(英文版)》编辑部
地址：北京市海淀区学院南路76号 邮政编码：100081
