Isothermal deformation embrittlement phenomenon and mechanism of high molybdenum non-magnetic steel

doi:10.13251/j.issn.0254-6051.2022.09.028

Abstract

Abstract: Thermodynamic characteristics of carbide precipitation in high molybdenum non-magnetic steel were calculated by using Thermal-Calc thermodynamic calculation software. The effect of aging temperature, isothermal deformation+aging temperature on the precipitation behavior of the tested steel was discussed by means of optical microscope, scanning electron microscope and other equipment, and the impact test was carried out. The results show that the precipitation phase is mainly produced at the grain boundary, and the temperature sensitive to precipitation of the tested steel is 700-900 ℃. After aging at 800 ℃ for 1 h, the formation of precipitates can be clearly observed at the grain boundaries of the tested steel, which are granular. Compared with no deformation, the precipitates are formed in large quantities under deformation conditions, the shape is strip-like, and the grain boundaries are obviously thickened. Compared with the aged specimens, the deformation before aging significantly shortens the incubation time of the precipitates and promotes the growth of the precipitates. After isothermal deformation+aging, the impact performance is significantly reduced, and the fracture mode is ductile fracture.

Key words: non-magnetic steel, isothermal deformation, precipitated phase, carbide

CLC Number:

TG161

Jiang Yiming, Qu Huapeng, Lang Yuping, Feng Hanqiu, Chen Haitao, Li Xiangming. Isothermal deformation embrittlement phenomenon and mechanism of high molybdenum non-magnetic steel[J]. Heat Treatment of Metals, 2022, 47(9): 158-163.

References

[1]张大权, 张家强, 王玉芳, 等. 中国非常规油气勘探开发进展与前景[J]. 资源科学, 2015, 37(5): 1068-1075.
Zhang Daquan, Zhang Jiaqiang, Wang Yufang, et al. China's unconventional oil and gas exploration and development: Progress and prospects[J]. Resources Science, 2015, 37(5): 1068-1075.
[2]邹才能, 陶士振, 白斌, 等. 论非常规油气与常规油气的区别和联系[J]. 中国石油勘探, 2015, 20(1): 1-16.
Zou Caineng, Tao Shizhen, Bai Bin, et al. Differences and relations between unconventional and conventional oil and gas[J]. China Petroleum Exploration, 2015, 20(1): 1-16.
[3]李长生, 马彪, 宋艳磊, 等. 无磁钢的研究概况和我国无磁钢的发展思路[J]. 河南冶金, 2014, 22(1): 1-7, 12.
Li Changsheng, Ma Biao, Song Yanlei, et al. The research progress and development ideas of non-magnetic steels in China[J]. Henan Metallurgy, 2014, 22(1): 1-7, 12.
[4]Qu H P, Chen H T, Cao C X, et al. Mechanism research on accelerated embrittlement phenomenon of a warm-deformed Cr-Mn-Ni-Mo-N austenitic stainless steel[J]. Materials Science and Engineering A, 2017, 680: 1-12.
[5]Lee T H, Oh C S, Chang G L, et al. Precipitation of σ-phase in high-nitrogen austenitic 18Cr-18Mn-2Mo-0.9N stainless steel during isothermal aging[J]. Scripta Materialia, 2004, 50(10): 1325-1328.
[6]李凯强, 屈华鹏, 冯翰秋, 等. 0Cr14Mn21NiN奥氏体不锈钢的析出行为[J]. 金属热处理, 2020, 45(1): 164-169.
Li Kaiqiang, Qu Huapeng, Feng Hanqiu, et al. Precipitation behavior of 0Cr14Mn21NiN austenitic stainless steel[J]. Heat Treatment of Metals, 2020, 45(1): 164-169.
[7]张世霄. 海洋油气钻采高氮奥氏体不锈钢加工工艺研究[D]. 唐山: 华北理工大学, 2016.
[8]邹章雄, 郎宇平, 屈华鹏, 等. 无磁钻铤用Cr-Mn-N奥氏体不锈钢组织性能研究[J]. 热加工工艺, 2013, 42(18): 147-152.
Zou Zhangxiong, Lang Yuping, Qu Huapeng, et al. Research on microstructure and properties of Cr-Mn-N austenitic stainless steel for non-magnetic drilling collar application[J]. Hot Working Technology, 2013, 42(18): 147-152.
[9]徐新芳. Nmag100无磁钢的组织和性能研究[D]. 沈阳: 东北大学, 2011.
[10]秦凤明, 李亚杰, 赵晓东, 等. 含N量对Mn18Cr18N奥氏体不锈钢的析出行为及力学性能的影响[J]. 金属学报, 2018, 54(1): 55-64.
Qin Fengming, Li Yajie, Zhao Xiaodong, et al. Effect of nitrogen content on precipitation behavior and mechanical properties of Mn18Cr18N austenitic stainless steel[J]. Acta Metallurgica Sinica, 2018, 54(1): 55-64.
[11]黄文克, 孔凡亚. 热处理对高强00Cr18Ni10N不锈钢丝组织与性能的影响[J]. 热加工工艺, 2009, 38(18): 127-131.
Huang Wenke, Kong Fanya. Influence of heat treatment on microstructure and mechanical property of high strength 00Cr18Ni10N stainless steel wire[J]. Hot Working Technology, 2009, 38(18): 127-131.
[12]杨伦. 固溶处理对316L不锈钢电弧打印件组织及性能的影响[D]. 西安: 西安理工大学, 2019.
[13]Li H, Jiang Z, Zhang Z, et al. Effect of grain size on mechanical properties of nickel-free high nitrogen austenitic stainless steel[J]. Journal of Iron and Steel Research International, 2009, 16(1): 58-61.
[14]陈蓉, 华浩, 吴安如, 等. 铬含量对00Cr25Ni7Mo3N双相不锈钢力学性能及耐腐蚀性能的影响[J]. 机械工程材料, 2016, 40(2): 26-28, 70.
Chen Rong, Hua Hao, Wu Anru, et al. Effects of chromium content on mechanical properties and corrosion resistance of 00Cr25Ni7Mo3N duplex stainless steel[J]. Materials for Mechanical Engineering, 2016, 40(2): 26-28, 70.

[1]	Cheng Ru, Tian Yong, Song Chaowei, Wang Haojie. Effect of vacuum low pressure carburizing on microstructure and properties of austenitic stainless steels 304 and 316L [J]. Heat Treatment of Metals, 2022, 47(9): 1-5.
[2]	Wang Zhiwen, Yang Rongdong, Huang Yuanchun, Li Hui. Effect of aging treatment on microstructure and mechanical properties of extruded 2195 Al-Li alloy [J]. Heat Treatment of Metals, 2022, 47(9): 6-11.
[3]	Wen Fangming, Hao Xiaobo, Cao Heng, Zhang Qiang, Li Bobo, Liu Yinqi. Effect of heat treatment process on microstructure and mechanical properties of N06600 alloy hot rolled plate [J]. Heat Treatment of Metals, 2022, 47(9): 113-118.
[4]	Wang Shikai, Wang Rui, Kang Yan, Yu Zhiqiang, Yan Zhijie. Effect of quenching temperature on microstructure and properties of Cr5MoVNi steel [J]. Heat Treatment of Metals, 2022, 47(9): 125-129.
[5]	Xiong Shujun, Wan Jia, Chen Jinshui, Guo Chengjun, Xiao Xiangpeng. Microstructure and properties of microalloyed Cu-Ni-Sn-P alloy [J]. Heat Treatment of Metals, 2022, 47(9): 164-170.
[6]	Zhou Lina, Liu Ming, Gao Xiang, Wang Wenxue, Tong Rui. Effect of austenitizing process on microstructure of Cr14Mo4V high temperature bearing steel [J]. Heat Treatment of Metals, 2022, 47(8): 7-15.
[7]	Yang Xiaobin, Dong Ji, Tian Chunying, Ning Baoqun, Zhao Qian, Qiao Zhixia, Liu Yongchang. Effect of magnetic field on tempered microstructure and mechanical properties of 25CrMo48V ultra-high strength steel [J]. Heat Treatment of Metals, 2022, 47(8): 24-33.
[8]	Shen Lijuan, Xie Gangsheng, Ma Yonglin, Xing Shuqing. Carbide dissolution behavior in GCr15 bearing steel during spheroidization annealing under condition of electromagnetic energy [J]. Heat Treatment of Metals, 2022, 47(8): 40-45.
[9]	Meng Jingzhu, Liu Rendong, Guo Jinyu, Xu Rongjie, Wang Keqiang, Pan Yong. Precipitation law of carbide containing aluminum in Fe-Mn-Al-C lightweight steel [J]. Heat Treatment of Metals, 2022, 47(8): 71-76.
[10]	Wei Haixia, Pan Jixiang, Ji Xianbin, Li Zhaoguo, Xu Bin. Effect of heat treatment on microstructure and hardness of economic high carbon martensitic stainless steel J50Cr13 [J]. Heat Treatment of Metals, 2022, 47(8): 148-151.
[11]	Tong Rui, Yu Xingfu, Liu Yongbao, Xia Yunzhi, Su Yong, Jin Yingli. Comparative analysis on properties of 8Cr4Mo4V steel for bearing after vacuum gas quenching and isothermal salt bath quenching [J]. Heat Treatment of Metals, 2022, 47(7): 9-14.
[12]	Xu Rongchang, Wang Yi, Sun Zonghui, Li Hui. Influence of heat treatment on microstructure and properties of Mo-containing bearing steel [J]. Heat Treatment of Metals, 2022, 47(7): 125-128.
[13]	Kuang Chengyang, Ma Yulin, Wang Chenyu, He Jiayong, Lu Kun. Effect of tempering temperature on microstructure and properties of heat-resistant steel [J]. Heat Treatment of Metals, 2022, 47(7): 129-133.
[14]	Zhang Kai, Zhang Jianping, Zhong Ning, Lu Shangwen. Effect of quenching and tempering process on microstructure and properties of Cr26 hypereutectic high chromium cast iron [J]. Heat Treatment of Metals, 2022, 47(7): 156-162.
[15]	Dong Yanchao, Ma Tiejun, Fu Hanguang, Jin Tounan, Yuan Naibo, Jin Tounan. Electron microscopy characterization for microstructure of Al-bearing high-boron high-speed steel [J]. Heat Treatment of Metals, 2022, 47(7): 177-182.