Thermodynamic calculation and analysis of equilibrium precipitation phases of G115 martensitic heat-resistant steel

doi:10.13251/j.issn.0254-6051.2021.11.005

Heat Treatment of Metals ›› 2021, Vol. 46 ›› Issue (11): 29-35.DOI: 10.13251/j.issn.0254-6051.2021.11.005

• MATERIALS RESEARCH • Previous Articles Next Articles

Thermodynamic calculation and analysis of equilibrium precipitation phases of G115 martensitic heat-resistant steel

Liu Xinyang^1,2, Chen Zhengzong², Zhou Yun¹, Wen Pengyu³, Bao Hansheng²

1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming Yunnan 650032, China;
2. Institute for Special Steels, China Iron & Steel Research Institute, Beijing 100081, China;
3. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received:2021-06-02 Online:2021-11-25 Published:2021-12-08

Abstract

Abstract: For manufacturing large castings of G115 martensitic heat-resistant steel weighing over 10 t, TCFe9 database in Thermo-Calc software was deployed to predict the role of varied solute atoms on precipitation behavior by simulating the equilibrium parameters of varied precipitates, and study the effect of major element in the G115 steel on types, amounts and precipitation temperatures of the equilibrium precipitated phases. The calculated results show that the precipitates of G115 martensitic heat-resistant steel at 650 ℃ mainly consist of MX phase (FCC-A1#2: NbC), M₂₃C₆, Laves phase and Cu-rich phase. The precipitation temperature of NbC, M₂₃C₆, Laves phase and Cu-rich phase is 1148 ℃, 871 ℃, 811 ℃, and 734 ℃, respectively. Among them, C and Cr strongly affect the precipitation of M₂₃C₆, and Nb and C affect that of NbC, W affects that of Laves phase, while B has no obvious influence on precipitation of all the phases.

Key words: G115 martensitic heat-resistant steel, Thermo-Calc calculation, precipitation phase, precipitation temperature

CLC Number:

TG142.33

Liu Xinyang, Chen Zhengzong, Zhou Yun, Wen Pengyu, Bao Hansheng. Thermodynamic calculation and analysis of equilibrium precipitation phases of G115 martensitic heat-resistant steel[J]. Heat Treatment of Metals, 2021, 46(11): 29-35.

References

[1]刘正东, 陈正宗, 包汉生, 等. 新一代马氏体耐热钢G115研发及工程化[M]. 北京: 冶金工业出版社, 2020.
[2]Abe F. Coarsening behavior of lath and its effect on creep rates in tempered martensitic 9Cr-W steels[J]. Materials Science and Engineering A, 2004, 387: 565-569.
[3]刘阿娇. G115 马氏体耐热钢铸钢的组织与性能研究[D]. 西安: 西安建筑科技大学, 2019.
[4]Abe F. Precipitate design for creep strengthening of 9%Cr tempered martensitic steel for ultra-supercritical power plants [J]. Science and Technology of Advanced Materials, 2008, 9: 1-15.
[5]李海昭, 梁军, 周超, 等. 正火温度对G115钢组织及650 ℃强度的影响[J]. 金属热处理, 2018, 43(2): 173-177.
Li Haizhao, Liang Jun, Zhou Chao, et al. Effect of normalizing temperature on microstructure of G115 steel and strength at 650 ℃ [J]. Heat Treatment of Metals, 2018, 43(2): 173-177.
[6]Danielsen H K,Hald J. Influence of Z-phase on long-term creep stability of martensitic 9-12%Cr steels[J]. VGB Power Technology, 2009, 89(5): 68-73.
[7]张红军, 周荣灿, 唐丽英, 等. P92钢650 ℃时效的组织性能研究[J]. 中国电机工程学报, 2009, 29(S1): 174-177.
Zhang Hongjun, Zhou Rongcan, Tang Liying, et al. Studies on microstructure and mechanical properties of P92 steel aged at 650 ℃ [J]. Proceedings of the CSEE, 2009, 29(S1): 174-177.
[8]姜运建, 张文建, 李文彬. Laves相和Z相对P92钢蠕变的影响[J]. 热力发电, 2009, 38(8): 55-58.
Jiang Yunjian, Zhang Wenjian, Li Wenbin. Influence of Laves phase and Z phase upon creep of P92 steel [J]. Thermal Power Generation, 2009, 38(8): 55-58.
[9]高加强, 洪杰, 肖新星, 等. 9Cr-2W耐热钢的微观组织及析出相的研究[J]. 动力工程学报, 2010, 30(4): 253-257.
Gao Jiaqiang, Hong Jie, Xiao Xinxing, et al. Study on microstructure and properties of 9Cr-2W heat-resistant steels[J]. Journal of Chinese Society of Power Engineering, 2010, 30(4): 253-257.
[10]严鹏. 新型马氏体耐热钢G115的组织与性能研究[D]. 北京: 清华大学, 2014.
[11]Horiuchi T, Igarashi M, Abe F. Improved utilization of added B in 9Cr heat-resistant steels containing W[J]. ISIJ International, 2002, 42: 67-71.

Thermodynamic calculation and analysis of equilibrium precipitation phases of G115 martensitic heat-resistant steel

PDF

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 3

Recommended Articles

Metrics

Comments

[1]	Li Xiaobing, Li Wei. Effect of solution temperature on microstructure and hardness of GH3600 superalloy [J]. Heat Treatment of Metals, 2020, 45(6): 51-54.
[2]	Wang Zhaomin, Wang Shuo, Shen Lei, Cheng Yi. Mechanical and properties of austenitic heat resistant steel 22Cr-25Ni after high temperature aging [J]. HTM, 2020, 45(3): 46-49.
[3]	Yang Sen1,Liu Jie1,Fan Guangwei2,Lv Xiaogen1,Wang Xin1. Aging precipitation phase of super austenitic stainless steel 254SMo [J]. HTM, 2016, 41(4): 79-82.