2Cr12Ni4Mo3VNbN钢中析出相的热力学计算与试验分析

doi:10.13228/j.boyuan.issn0449-749x.20210779

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Abstract In order to analyze the influence of the main equilibrium precipitated phase and alloying element content in the 2Cr12Ni4Mo3VNbN steel on the precipitation behavior of the precipitated phase, the equilibrium phase diagram of 2Cr12Ni4Mo3VNbN steel was calculated by Thermo-Calc thermodynamic software when all elements in the composition range were median, and the equilibrium phase diagram of steel when the content of C, Cr, Mo, Nb, and N changed was calculated. To verify the reliability of thermodynamic calculations, XRD, SEM and TEM analysis methods were used to identify the types of precipitates in the heat-treated 2Cr12Ni4Mo3VNbN steel. The results show that the equilibrium precipitated phases in steel are MX phase, M₂₃C_6, M₆C, Z phase and Laves phase. Under thermodynamic equilibrium conditions, MX phase transforms into Z phase at 850 ℃, and M₆C transforms to Laves phase at 787 ℃. However, in the heat treatment process, due to the short holding time and the faster cooling rate, the above conversion process will not occur, so the main precipitated phases in the steel are MX phase, M₂₃C₆and M₆C. The types of equilibrium precipitates are basically consistent with the experimental results of microstructure observation and phase analysis. There are large-scale primary MX phases and nano-level MX phases in the MX phase. MX phase is mainly affected by Nb and N. The precipitation amount increases with the increase of N content, and the precipitation temperature increases with the increase of Nb content. The precipitation temperature of M₂₃C₆ phase increases with the increase of C content, and the precipitation amount increases with the increase of C content. The precipitation temperature of M₆C decreases with the increase of Cr content, and increases with the increase of Mo content. Within the composition range, the element control principle is to increase the C content to increase the precipitation strengthening effect of M₂₃C₆, reduce the Cr content to avoid entering the δ-Fe phase area during hot working, reduce the Mo content to reduce the precipitation tendency of the Laves phase, reduce the Nb content to Lower the precipitation temperature of the primary MX phase, the N content needs to take an intermediate amount to reduce the precipitation of the primary MX phase, and increase the precipitation of the dispersed fine MX phase in the low temperature stage.

Key words： Thermo-Calc software equilibrium precipitation phase 2Cr12Ni4Mo3VNbN steel thermodynamic blade

Received: 20 December 2021

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210779 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I5/129

[1] Zachary J, Koza D J. The long and short of last-stage blades[J]. The Magazine of Power Generation and Plant Energy Systems, 2006, 150(9): 40.
[2] 唐郑磊,李忠波,张阳,等. 水电站座环及导叶用钢SXQ500/550DZ35热力学计算及析出相分析[J]. 轧钢, 2020, 37(4): 23.(TANG Zheng-lei,LI Zhong-bo,ZHANG Yang,et al. Thermodynamic calculation and precipitation phase analysis of SXQ500/550DZ35 steel for seat ring and guide vane of hydropower station[J]. Steel Rolling, 2020, 37(4): 23.)
[3] 梅林波, 沈红卫, 刘霞. 汽轮机末级长叶片材料的开发和序列构建[J]. 热力透平, 2017, 46(1): 9.(MEI Lin-bo, SHEN Hong-wei, LIU Xia. Development and series structure for last stage blade materials of steam turbines[J]. Thermal Turbine, 2017, 46(1): 9.)
[4] 李龙雨, 席生岐, 王虹, 等. 2Cr12Ni4Mo3VNbN材料热处理工艺及回火硬化机理的研究[C]//第十三届全国典型零件热处理学术及技术交流会暨第十届全国热处理学会物理冶金学术交流会论文集. 伊春:中国机械工程学会, 2015: 13.(LI Long-yu, XI Sheng-qi, WANG Hong, et al. Study on heat treatment process and temper hardening mechanism of 2Cr12Ni4Mo3VNbN turbine blade steel[C]//Proceedings of the 13th National Conference on Heat Treatment of Typical Parts and the 10th National Conference on Physical Metallurgy of Heat Treatment. Yichun:Chinese Mechanical Engineering Society, 2015: 13)
[5] 高圆, 席生岐, 王虹, 等. 2Cr12Ni4Mo3VNbN新型叶片钢高频淬火后的显微组织与疲劳性能[J]. 材料热处理学报, 2020, 41(2): 75.(GAO Yuan, XI Sheng-qi, WANG Hong, et al. Microstructure and fatigue properties of 2Cr12Ni4Mo3-VNbN new blade steel after high-frequency quenching[J]. Journal of Heat Treatment of Materials, 2020, 41(2): 75.)
[6] 石如星, 刘正东, 张才明. P92耐热钢δ-铁素体含量的热力学计算与试验分析[J]. 钢铁, 2011, 46(11): 89.(SHI Ru-xing, LIU Zheng-dong, ZHANG Cai-ming. Thermodynamic calculation and erperimental measurement of δ-ferrite amount in P92 heat resistant steel[J]. Iron and Steel, 2011, 46(11): 89.)
[7] 丁雅莉, 苏杰, 陈嘉砚, 等. S-04马氏体时效不锈钢析出相的热力学计算及强化工艺的优化[J].钢铁研究学报, 2003, 15(6): 38.(DING Ya-li, SU Jie, CHEN Jia-yan, et al. Thermodynamic calculation of precipitates and optimization of strengthening technology of maraging stainless steel S-04[J]. Joural of Iron and Steel Research, 2003, 15(6): 38.)
[8] 徐敏, 杨武强, 张斌, 等. 镍基高温合金GH141平衡析出相的热力学计算分析[J]. 稀有金属材料与工程, 2016, 45(11): 2925.(XU Min, YANG Wu-qiang, ZHANG Bin, et al. Thermodynamic calculation of equilibrium precipitation phases in GH141 Ni-based superally[J]. Rare Metal Materials and Engineering, 2016, 45(11): 2925.)
[9] 李奇, 秦鹤勇, 郭翠萍, 等. 镍基高温合金GH4706析出相的热力学计算与分析[J]. 钢铁研究学报, 2017, 29(3): 208.(LI Qi, QIN He-yong, GUO Cui-ping, et al. Thermodynamic calculation and thepretical analysis of equilibrium precipitation phase in Ni-based superalloy GH4706[J]. Journal of Iron and Steel Research, 2017, 29(3): 208.)
[10] 陈林恒,桑晨,童志,等.高强耐火钢中合金元素在焊接热循环作用下的偏聚行为[J].上海金属,2021,43(2):27.(CHEN Lin-heng,SANG Chen,TONG Zhi,et al. Segregation behavior of alloying elements in high-strength fire-resistant steel during welding thermal cycle[J]. Shanghai Metal, 2021,43(2):27.)
[11] 黎建全, 吴国荣, 孙彦辉, 等. P590L连铸过程C、N化物析出行为[J]. 连铸, 2021 (4): 17. (LI Jian-quan, WU Guo-rong, SUN Yan-hui, et al. Precipitation behavior of carbonitride in P590L steel in CC process[J]. Continuous Casting,2021 (4): 17.)
[12] Taneike M,Abe F, Sawada K. Creep-strengthening of steel at high temperatures using nano-sized carbonitride dispersions[J]. Nature, 2003, 424(6946): 294.
[13] 胡正飞. 马氏体耐热钢的应用研究与评价[M].北京: 科学出版社, 2018.(HU Zheng-fei. Application Research and Evaluation of Martensitic Heat Resistant Steel[M]. Beijing: Science Press, 2018)
[14] Yamada K, Igarashi M, Muneki S, et al. Creep properties affected by morphology of MX in high-Cr ferritic steels[J]. ISIJ International, 2001, 41(sl): 116.
[15] 江旭, 马煜林, 刘越. 回火温度对CB2钢的含硼M₂₃C₆相析出及力学性能的影响[J]. 材料导报, 2019, 33(12): 2062.(JIANG Xu, MA Yu-lin, LIU Yue. Effect of tempering temperature on precipitation and mechanical preperties of boroncontaining M₂₃C₆ phase in CB2 steel[J]. Materials Repoerts, 2019, 33(12): 2062.)
[16] Hosoi Y, Wade N, Kunimitsu S, et al. Precipitation behavior of laves phase and its effect on toughness of 9Cr-2Mo Ferritic-martensitic steel[J]. Journal of Nuclear Materials, 1986, 141/142/143(3): 461.
[17] Hald J. Metallurgy and creep properties of new 9-12%Cr steels[J]. Steel Research, 1996, 67(9):369.
[18] ZHENG Lei, ZHANG Mai-cang, DONG Jian-xin. Relationship between grain boundary segregation of antimony and temper embrittlement in titanium-doped nickel-chromium steel[J]. Journal of Iron and Steel Research, International, 2011, 18(1): 68.
[19] 吕知清, 肖少彬, 吴之博, 等. 溶质元素晶界偏聚行为的研究现状[J].燕山大学学报, 2019,43(6): 471.(LÜ Zhi-qing, XIAO Shao-bin, WU Zhi-bo, et al. Research status of segregation behaviors of solute atoms on grain boundary[J]. Journal of Yanshan University, 2019, 43(6): 471.)