Analysis of transient creep behavior of P91 steel

doi:10.13251/j.issn.0254-6051.2021.08.004

Abstract

Abstract: Transient creep deformation behavior of the P91 steel under different stress levels at 600 ℃ and 620 ℃ respectively was systematically studied. By coupling the interaction between internal dislocations and precipitated phases in the material during creep process to the internal stress, combined with Orowan equation, the transient creep model parameters were determined by the nonlinear fitting method, and the deformation curve of the P91 steel in the transient creep stage was numerically simulated. The results show that the numerical simulation results are in good agreement with the experimental data, indicating that it is feasible to apply the model to study the transient creep behavior of the P91 steel. At the same time, combined with the fact that the transient creep time and normalized transient strain depend on the temperature and the stress, it is further confirmed that the transient creep of the P91 steel at 600 ℃ and 620 ℃ respectively and in the stress range of 135-175 MPa is mainly controlled by the dislocation climbing process.

Key words: P91 steel, dislocation climbing, constitutive equation, transient creep mechanism

CLC Number:

TG144

Wang Ni, Liu Xinbao, Zhu Lin, Li Bo, Quan Chen. Analysis of transient creep behavior of P91 steel[J]. Heat Treatment of Metals, 2021, 46(8): 20-25.

References

[1]符栋良, 任发才. 电站锅炉用改进型9Cr-1Mo耐热钢高温蠕变行为研究[J]. 锅炉技术, 2018, 49(6): 59-62.
Fu Dongliang, Ren Facai. Investigation on creep behavior of modified 9Cr-1Mo heat-resistant steel used for power plant boiler at elevated temperatures[J]. Boiler Technology, 2018, 49(6): 59-62.
[2]黄格省, 李振宇, 王建明. 我国现代煤化工产业发展现状及对石油化工产业的影响[J]. 化工进展, 2015, 34(2): 295-302.
Huang Gesheng, Li Zhenyu, Wang Jianming. Development status of coal chemical industry in China and its influence on petrochemical ndustry[J]. Chemical Industry and Engineering Progress, 2015, 34(2): 295-302.
[3]王兆民, 王硕, 申雷, 等. 22Cr-25Ni奥氏体耐热钢高温时效的组织及性能[J]. 金属热处理, 2020, 45(3): 46-49.
Wang Zhaomin, Wang Shuo, Shen Lei, et al. Mechanical and properties of austenitic heat resistant steel 22Cr-25Ni after high temperature aging[J]. Heat Treatment of Metals, 2020, 45(3): 46-49.
[4]吕鹏, 陈亚楠, 关庆丰, 等. 新型超超临界机组用叶片钢11Cr12Ni3Mo2VN的热变形行为[J]. 材料导报, 2020, 34(4): 4113-4117.
Lü Peng, Chen Ya'nan, Guan Qingfeng, et al. The high-temperature deformation behavior of novel 11Cr12Ni3Mo2VN heat resistant steel for ultra-sup ercritical units[J]. Materials Review, 2020, 34(4): 4113-4117.
[5]宋畅, 吕俊复, 杨海瑞, 等. 超临界及超超临界循环流化床锅炉技术研究与应用[J]. 中国电机工程学报, 2018, 38(2): 338-347.
Song Chang, Lü Junfu, Yang Hairui, et al. Research and application of supercritical and ultra-supercritical circulating fluidized bed boiler technology[J]. Proceedings of the CSEE, 2018, 38(2): 338-347.
[6]Ren Facai, Wang He, Tang Xiaoying, et al. Creep rupture behavior and microstructural evolution of modified 9Cr-1Mo heat-resistant steel[J]. Journal of Iron and Steel Research International, 2018, 25(12): 1303-1310.
[7]Dudko V, Belyakov A, Molodov D, et al. Microstructure evolution and pinning of boundaries by precipitates in a 9 pct Cr heat resistant steel during creep[J]. Metallurgical and Materials Transactions A, 2011, 44(S1): 162-172.
[8]辛甜, 刘新宝, 朱麟, 等. 磁性测量的高温蠕变状态参数化表征[J]. 西北大学学报(自然科学版), 2016, 46(6): 852-856.
Xin Tian, Liu Xinbao, Zhu Lin, et al. Magnetic characterization of creep at elevated temperature[J]. Journal of Northwest University(Natural Science Edition), 2016, 46(6): 852-856.
[9]郝巧娥. P91钢高温蠕变行为及电磁超声谐振表征研究[D]. 西安: 西北大学, 2016.
Hao Qiao'e. The study of creep bahavior at elevated temperature and electromagnetic acoustic resonance charaterization of P91 steel[D]. Xi'an: Northwest University, 2016.
[10]毕瑶, 刘新宝, 朱麟, 等. 高温蠕变过程中高铬耐热钢的电化学极化行为[J]. 金属热处理, 2019, 44(11): 213-218.
Bi Yao, Liu Xinbao, Zhu Lin, et al. Electrochemical polarization behavior of high chromium heat-resistant steel during high-temperature creep[J]. Heat Treatment of Metals, 2019, 44(11): 213-218.
[11]Muvdi B B, Giemza C J. Primary creep in aircraft design[R]. Society of Automotive Engineers International, 1958.
[12]王佰智, 温志勋, 刘大顺, 等. 镍基单晶高温合金沉淀相尺度效应研究[J]. 稀有金属材料与工程, 2015, 352(11): 151-154.
Wang Baizhi, Wen Zhixun, Liu Dashun, et al. Influence of precipitate size on the strength of nickel-base single crystal superalloys[J]. Rare Metal Materials and Engineering, 2015, 352(11): 151-154.
[13]Martin J L, Piccolo B L, Kruml T, et al. Characterization of thermally activated dislocation mechanisms using transient tests[J]. Materials Science and Engineering A, 2002, 322(1/2): 118-125.
[14]Ahlquist C N, Gascaneri R, Nix W D. A phenomenological theory of steady state creep based on average internal and effective stresses[J]. Acta Metallurgica, 1970, 18(6): 663-671.
[15]Chang Y J, Nam S W, Ginsztler J. Activation processes of stress relaxation during hold time in 1Cr-Mo-V steel[J]. Materials Science and Engineering A, 1999, 264(1/2): 188-193.
[16]Esposito L, Bonora N. A primary creep model for class M materials[J]. Materials Science and Engineering: A, 2011, 528(16/17): 5496-5501.
[17]刘剑秋, 刘新宝, 朱麟, 等. 9Cr-1Mo耐热钢蠕变过程中可动位错演化行为表征[J]. 西北大学学报(自然科学版), 2018, 48(1): 66-70.
Liu Jianqiu, Liu Xinbao, Zhu Lin, et al. Characterization of mobile dislocation evolution in 9Cr-1Mo heat-resistant steel during elevated temperature creep[J]. Journal of Northwest University(Natural Science Edition), 2018, 48(1): 66-70.
[18]朱麟, 刘新宝, 辛甜, 等. 基于微观组织演化的P91钢长时蠕变寿命预测[J]. 材料导报, 2017, 31(10): 137-140, 145.
Zhu Lin, Liu Xinbao, Xin Tian, et al. Prediction oflong-term creep rupture time of P91 steel based on microstructure evolution[J]. Materials Review, 2017, 31(10): 137-140, 145.
[19]程晓农, 王铖, 张楠, 等. 新型Cr18Ni9NbTiN奥氏体不锈钢的高温蠕变行为[J]. 金属热处理, 2016, 41(3): 114-118.
Cheng Xiaonong, Wang Cheng, Zhang Nan, et al. High temperature creep behavior of a novel Cr18Ni9NbTiN austenitic stainless steel[J]. Heat Treatment of Metals, 2016, 41(3): 114-118.
[20]Estrin Y, Mecking H. A unified phenomenological description of work hardening and creep based on one-parameter models[J]. Acta Metallurgica, 1984, 32(1): 57-70.
[21]Hayes R W. Minimum strain rate and primary transient creep analysis of a fine structure orthorhombic titanium aluminide[J]. Scripta Materialia, 1996, 34(6): 1005-1012.
[22]Malakondaiah G, Prasad N, Sundararajan G, et al. An analysis of the transient stage in low stress viscous creep[J]. Acta Metallurgica, 1988, 36(8): 2167-2181.
[23]Gollapudi S, Satyanarayana D V V, Phaniraj C, et al. Transient creep in titanium alloys: Effect of stress, temperature and trace element concentration[J]. Materials Science and Engineering: A, 2012, 556: 510-518.
[24]Burton B. Diffusional creep of polycrystalline materials[J]. Ceramurgia International, 1977, 3(3): 128-129.
[25]Tang F, Nakazawa S, Hagiwara M. Transient creep of Ti-Al-Nb alloys[J]. Materials Science and Engineering: A, 2002, 325(1/2): 194-201.