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 9期
刊出日期：2018-09-15
883
Kyu-tae Park . Hyun-chul Park
Effects of design parameters and tension on behavior of a coil using finite element analysis
During the thin strip coiling process, it is necessary to use a sleeve with a mandrel to prevent excessive deformation of the strip. Stress distribution in the sleeve and in the strip is an important factor that determines the quality of the coil. However, owing to the accumulation of high pressure, it is dif.cult to determine the stress distribution through experimentation. Thus, stress analysis of the strip coiling process was conducted. Finite element analysis was used to investigate the effects of the weight of the strip and the mandrel on the stress distribution and stress concentration near the starting point of the coil. The radial stress was predicted for a coil with a stacked thickness of 384 mm, which corresponds to a strip length of 1486 m, using the stress analysis model developed in a preceding research. A method was presented to reduce the weight and radial stress of a strip coil. It was found that the deformation of the sleeve can be reduced by decreasing the gap between the mandrel segments. The thickness of the sleeve can be reduced from 120 to 106 mm using the stress analysis results. Furthermore, coiling tension can be reduced by 44% compared to the existing value considering the interlayer slip of the strip coil.
2018 Vol. 25 (9): 883-891 [
摘要
] (
125
) [
HTML
1KB] [
PDF
0KB] (
178
)
892
Zhong-kai Ren,, . Hong Xiao, . Hong-biao Xie, . Xiao Liu,
Influence of lateral displacement on strip shape during cold rolling
The theory of metal plastic deformation is an important part of the strip shape control theories. In order to control the shape and gauge accurately during cold thin strip rolling, the mechanism of the metal lateral .ow must be revealed clearly. Therefore, the lateral displacement of thin strip was studied by the grid method. Those grids with a line thickness of 10 lm and clear boundaries were successfully manufactured on the strip surface using lithography. Then, the effects of reduction, front andback tension, and taper angle of the .rst intermediate roll on the metal lateral .ow were studied. The strip shape was calculated with and without considering the lateral displacement; furthermore, the calculations were compared with the measured results. The results show that the calculations with considering the lateral displacement are closer to the measured results. In addition, the comparison of .nite element analysis results with the experimental results indicates that the test method was reliable.
2018 Vol. 25 (9): 892-900 [
摘要
] (
102
) [
HTML
1KB] [
PDF
0KB] (
168
)
901
Li Xie . An-rui He . Chao Liu
A rapid calculation method for predicting roll deformation of six-high rolling mill
The method to predict roll deformation precisely and efficiently is vital for the strip shape control of six-high rolling mill. The traditional calculation methods of roll deformation, such as the finite element method and the influence function method, have been widely used due to their accuracies. However, the required calculation time is too long to be applied to the real-time control. Therefore, a rapid calculation method for predicting roll deformation of six-high rolling mill is proposed, which employs the finite difference method to calculate the roll deflection and uses a polynomial to describe the non-linear relationship between roll flattening and roll contact pressure. Furthermore, a new correction strategy is proposed in the iteration, where the roll center flattening and the roll flattening deviation are put forward and are corrected simultaneously in the iterative process according to the static equilibrium of roll. Finally, by the comparison with traditional methods, the proposed method is proved to be more efficiency and it’s suitable for the on-line calculation of the strip shape control.
2018 Vol. 25 (9): 901-909 [
摘要
] (
116
) [
HTML
1KB] [
PDF
0KB] (
149
)
910
Yuan-dong Pei,, . Sheng-li Wu . Xiao-jing Shao, . Zhi-xing Zhao, . Gang An . Ze-jun Ma, . Wei-dong Zhang,
Establishment and industrial practice of high-temperature process evaluation system in sintering
The behaviors of typical iron ores at high temperature were observed by confocal scanning laser microscopy. Four critical temperature points and liquid flow velocity at high temperatures of iron ores were obtained and the temperature points contain temperature at which sample starts to shrink, temperature at which the initial liquid phase forms, temperature at which a lot of liquid forms and temperature at which liquid consolidation ends. Under the same CaO to Fe2O3 ratio, the liquid phase fluidity of iron ore fines of Carajas (IOC) is good. However, under the same basicity, as the content of SiO2 in IOC is low, the liquid phase fluidity of IOC is muchsmaller than that of Yandi fine. After analysis of the initial formation and development of the liquid phase and the final consolidation process, the high-temperature process evaluation system (HTPES for short) of iron ore was established. The idea of "dense ore matching fusible ore" instead of "relatively fusible ore" was proposed based on the results of HTPES and applied in ore matching of a sinter plant from Shougang Jingtang. The use of IOC (13–18%) instead of standard sintering fines (SSF) improved liquid phase fluidity and ensured the sinter quality. Furthermore, the use of IOC fine (18–23%) with Hainan fine (0–2%) instead of SSF, a mixture of hematite and MarraMamba ore and concentrates guaranteed the quality of sinter ore through improving fluidity, in the meantime reducing ore matching costs. With the establishment and application of HTPES, the sinter plant has achieved good economic benefits under the premise of ensuring the quality of sinter ore.
2018 Vol. 25 (9): 910-922 [
摘要
] (
83
) [
HTML
1KB] [
PDF
0KB] (
159
)
923
Xu Li . Yang Li . Ying-hui Wei, . Li-feng Hou . Bao-sheng Liu . Hong-bo Qu . Yi-de Wang
Effect of surface self-nanocrystallization and Si infiltration on Si diffusion behavior, hardness and magnetic properties of pure Fe
Surface nanocrystallization of pure Fe was performed using an improved surface treatment process. The phase transfor-mation and Si in.ltration depth of the pure Fe before and after surface mechanical attrition treatment (SMAT) were compared by X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. The results indicated that nanocrystallization of Fe surface was achieved using SMAT, which resulted in deeper penetration of Si. Prolonging time of SMAT and Si in.ltration also resulted in increasing microhardness, with the hardness .rst increasing with increasingdistance from the surface and then decreasing. Furthermore, longer Si in.ltration time, nanocrystallization of Si and longer SMAT time resulted in higher saturation magnetization (MS). The greatest Si penetration depth (150 lm), maximum hardness (280 HV), and maximum MS (1.849 9 106 A/m) were achieved after SMAT for 45 min and Si in.ltration for 9 h. The interaction between adjacent grains after surface nanocrystallization leads to a region of the magnetic domain wall structure located at the grain boundary, which causes the remanence enhancement effect.
2018 Vol. 25 (9): 923-931 [
摘要
] (
79
) [
HTML
1KB] [
PDF
0KB] (
151
)
932
Yong-gang Deng . Hong-shuang Di . R. D. K. Misra
On significance of initial microstructure in governing mechanical behavior and fracture of dual-phase steels
Different initial microstructures were obtained through annealing and cold-rolling. Subsequently, steels with ferrite-pearlite (FP), ferrite-martensite (FM) and completely martensite (M) microstructure were intercritically heat treated at 780 °C for 5 minutes followed by water quenching to obtain ferrite-martensite dual-phase microstructures. We have elucidated here the significance of initial microstructure on ultimate microstructure, mechanical properties, strain hardening behavior and fracture mechanism in dual-phase steels. FP, FM and M initial microstructure yielded different martensite morphologies, notably, chain-like networked structure, fine and fibrous martensite structure, respectively. Furthermore, with increaed martensite volume fraction in the initial microstructure, the average ferrite grain size was significantly refined from 12.3 to 2.1 μm, such that yield strength and tensile strength were increased, while total elongation remained unaffected, uniform elongation and strain hardening ability were increased. A comparison of mechanical properties for different initial microstructure suggested that when the initial microstructure was completely martensite, the steel had excellent mechanical properties, UTS×UE was 122.5 J?cm-3, which was 24% greater compared to the conventional continuous annealed steels with ferrite-pearlite initial microstructure (98.8 J?cm-3). The variation in strength, elongation, strain hardening behavior and fracture mechanism of steels with different initial microstructure are discussed in relation to the ultimate microstructure.
2018 Vol. 25 (9): 932-942 [
摘要
] (
65
) [
HTML
1KB] [
PDF
0KB] (
152
)
943
Shang-lin Lv . Zhong-min Yang . Bin Zhang, . Jie Chen . Ying Chen . Xiao-bin Li
Corrosion passive behaviour duplexstainlesssteelat different rates simulated marine-environmentsolution
The corrosion and passive behaviour of duplex stainless steel 2205 at six cooling rates (1, 5, 10, 15, 20 Cs -1 and water quenched) in a simulated marine-environment solution was investigated using electrochemical measurements of poten-tiostatic critical pitting temperature, potentiodynamic polarisation curves, electrochemical impedance spectroscopy and Mott–Schottky curves. The microstructural evolution and pitting morphologies of the specimens were visualised using an optical microscope and scanning electron microscope. The electrochemical responses of the passive .lm show that passivity of the steel was enhanced as the cooling rate increased; however, the threshold cooling rate was 20 Cs -1, beyond which pitting corrosion resistance remained stable. Based on the analyses of microstructural evolution and pit morphologies, the proportion of the ferrite phase increased with the cooling rate and the ratio of austenite and ferrite was close to 1:1. The pitting size decreased as the cooling rate increased, and most metastable pits on specimens were located in the ferrite phase and on the ferrite–austenite interface. Thus, pitting resistance of steel is governed by the phase that provides the lowest pitting resistance equivalent number. The optimised pitting corrosion resistance for steel 2205 was achieved when it was greater than or equal to 20 Cs -1.
2018 Vol. 25 (9): 943-953 [
摘要
] (
76
) [
HTML
1KB] [
PDF
0KB] (
152
)
954
Hai-feng Xu . Gui-lin Wu . Chang Wang . Jian Li . Wen-quan Cao
Microstructure, hardness and contact fatigue properties of X30N high nitrogen stainless bearing steel
Microstructure, hardness and fatigue properties of X30N high nitrogen stainless bearing steel were investigated. It was found that nitrogen addition could effectively reduce the amount and size of coarse carbides. The original austenite grain size was obviously re.ned. Additionally, more retained austenite was found in X30N steel after quenching at 1050 C, which couldbe reduced from about 30% to about 6% by cold treatment at -73 Cand subsequent tempering, and thus, the ultimate hardness was increased up to about 61 HRC with reduction of austenite and precipitation of carbonitrides. Furthermore, the rolling contact fatigue lives of X30N steel are superior to those of 440C steel, which was attributed to the enhanced hardness and a certain retained austenite in the high nitrogen steel.
2018 Vol. 25 (9): 954-967 [
摘要
] (
102
) [
HTML
1KB] [
PDF
0KB] (
164
)
968
Yan-jun Yin . Ji-quan Sun . Ai-min Zhao . Jin Gou
Ultra-low-carbon steel spheroidization and torsion
In this work, the study of spheroidization annealing and torsion tests of 0.027wt% carbon steel rod was carried out. The spheroidization kinetic behavior at 943 K (670 °C) under deformed and non-deformed state was measured furthermore the kinetic curves were predicted by JMAK equation and agree well with experimental ones. After performing the spheroidization process twice the spherical cementite and precipitated carbides were smaller and the distribution more uniform. The comparison of materials subjected to single and double spheroidization annealing showed the difference in grain size, and the torsion performance was greatly improved under twice spheroidization, especially, the maximum torque with tiny variations.
2018 Vol. 25 (9): 968-974 [
摘要
] (
65
) [
HTML
1KB] [
PDF
0KB] (
139
)
975
Bo Jiang, . Gui-jie Li, . Hui-qun Liu, . Dan-qing Yi, . Ying Zhang, . Ren-hao Xue , . Quan Wen . Zhi-yuan Liu . Liang Ning . Xian-ming Wang
Superhydrophobic coating on heat-resistant steel surface fabricated by a facile method
Industrial application of superhydrophobic surfaces is often hindered by complicated process and sophisticated machines. A facile wet etching method (sandblast, HCl and sandblast/HCl) with vapor deposition of PFDS (1H, 1H, 2H, 2H-per.uorodecyltriethoxysilane) was applied to fabricate superhydrophobic surface ofheat-resistant steel used for vane. The coating component, surface morphology and surface roughness parameters of sample were observed by attenuated total re.ectance Fourier transform infrared spectroscopy, scanning electron microscopy and atomic force microscopy. Static water contact angle (WCA) of samples with and without PFDS coating was measured by contact angle goniometer. The results showed that WCA values of polished, sandblast, HCl and sandblast/HCl-etched samples are 98.,97., 100. and 101., respectively, and increase to 112., 148., 151.and 154.after vapor deposition of PFDS. The sandblast/HCl-etched sample with PFDS coating shows higher superhydrophobicity because of very large surface roughness and lotus protrusion-like structure. The superhydrophobicity of this fabricated surface has no obvious change after 38 cycles of the .lm adhesion test, indicating excellent durability.
2018 Vol. 25 (9): 975-983 [
摘要
] (
75
) [
HTML
1KB] [
PDF
0KB] (
146
)
984
De-hong Lu . Hai-zhou Li . Bo Ren
Effect of Si content on impact-abrasive wear resistance of Al2O3p/steel composites prepared by squeeze casting
The 40Cr steel matrix composites were reinforced with Al2O3 particulates (Al2O3p) through Si adding to improve the impact-abrasive wear resistance, in which Si powder ranging up to 25% of the Al2O3p weight was added into the Al2O3p preforms; then, the composites were fabricated by squeeze casting. For all composites, alumina particles are evenly distributed, and Si powder is dissolved in the matrix. Without Si powder addition, the 40Cr steel matrix contains only pearlite; however, ferrite appears and increases with Si powder addition. In the impact-abrasive wear tests, the impact frequency is 80 min–1 and the impacting energy is 2 J. With increasing Si powder, the wear of the composites .rst decreases obviously, reaches the minimum at 10% and then increases. The effect of Si addition on the wear resistance can be attributed to two reasons: one is increasing the hardness of the matrix, and the other is improving the interfacial bonding between Al2O3p and steel. The wear mechanism of the composites is abrasive wear when the Si powder is \10 wt%. Otherwise, it is a mixed mode of abrasive and delamination wear.
2018 Vol. 25 (9): 984-994 [
摘要
] (
81
) [
HTML
1KB] [
PDF
0KB] (
137
)
995
Zhong-lin Hou, . Li-ming Liu . Xin-ze Lv . Jun Qiao . Hong-yang Wang
Numerical simulation for pulsed laser–gas tungsten arc hybrid welding of magnesium alloy
Based on the extended application of COMSOL, a novel type of dual heat source model for pulsed laser-GTA hybrid welding was established. This model successfully solved the inaccuracy problem of simulation caused by energy superposition effect between laser and arc due to their different physical characteristics. Numerical simulation for pulsed laser-GTA hybrid welding of Magnesium alloy process was conducted, and the simulation results show good agreements with the measured thermal cycle curve and the shape of weld beads. Effects of pulse laser parameters (laser excited current, pulse duration and pulse frequency) on the temperature field and weld-pool were investigated. The experiment and simulation results show that when the laser pulse energy keeps constant, welding efficiency of the hybrid heat source is increased by increasing laser current and decreasing pulse duration due to the increased ratio of the weld bead depth to width. At large laser currents, severe spattering tends to occur. For a better welding process, the laser current should be controlled in the range of 150A-175A, the pulse duration should be greater than 1ms, and the pulse frequency should be equal to or slightly greater than 20Hz.
2018 Vol. 25 (9): 995-1002 [
摘要
] (
73
) [
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
