Influence of tempering process on mechanical properties of 17Cr16Ni2 stainless steel bolts for brake levers

doi:10.13251/j.issn.0254-6051.2025.04.025

Abstract

Abstract: For 17Cr16Ni2 stainless steel bolts used in train brake lever systems, both high tensile properties and excellent impact property are required during service, and tempering process plays a key role in regulating and improving the mechanical properties of the 17Cr16Ni2 stainless steel. Different tempering treatment processes were designed, and the tensile properties and impact absorbed energy of the tempered specimens were evaluated through tensile and impact tests, while microstructure and impact fracture morphologies were characterized. The results demonstrate that two-stage tempering process significantly enhances the impact property of the 17Cr16Ni2 stainless steel bolts while maintaining its tensile properties. The optimal heat treatment for the 17Cr16Ni2 stainless steel bolts identified as: 1000 ℃×180 min quenching, 635-650 ℃ first tempering and 600-620 ℃ second tempering. After this process, the bolt exhibits a tensile strength of 910.0-957.0 MPa, a yield strength of 746.5-829.0 MPa, and a room-temperature impact absorbed energy of up to 50 J, far exceeding the design specifications.

Key words: brake lever, 17Cr16Ni2 stainless steel bolt, tempering treatment, tensile properties, impact absorbed energy

CLC Number:

TG156.5

Li Yanjun, Chen Bo, Zhang Yanan, Dong Chenxi, Li Xiongbing. Influence of tempering process on mechanical properties of 17Cr16Ni2 stainless steel bolts for brake levers[J]. Heat Treatment of Metals, 2025, 50(4): 174-179.

References

[1] Zhang Y, Dang H, Quan S, et al. Model of fatigue crack propagation rate based on crack tip opening displacement as the driving parameter[J]. Modern Physics Letters B, 2022, 36(18): 2242043.
[2] Zhang M, Li L, Wang D, et al. Fatigue failure mechanism analysis of 1Cr17Ni2 stainless steel blades ground by an abrasive belt[J]. Frontiers in Materials, 2023, 10: 1166836.
[3] 王志武, 宋涛. 高温服役3×10⁵ h后汽缸螺栓用20Cr1Mo1V1钢的应力松弛性能[J]. 机械工程材料, 2013, 37(2): 74-77.
Wang Zhiwu, Song Tao. Stress relaxation of 20Cr1Mo1V1 steel for cylinder bolt after working for 3×10⁵ h at high temperature[J]. Materials for Mechanical Engineering, 2013, 37(2): 74-77.
[4] 彭谦之, 左华付, 李建军, 等. 回火工艺对1Cr17Ni2不锈钢锻后回火硬度的影响[J]. 金属热处理, 2020, 45(1): 112-116.
Peng Qianzhi, Zuo Huafu, Li Jianjun, et al. Effect of tempering on hardness of forged 1Cr17Ni2 stainless steel[J]. Heat Treatment of Metals, 2020, 45(1): 112-116.
[5] 徐桂芳, 刘文通, 张伯承, 等. 热处理工艺对大尺寸1Cr17Ni2钢组织与性能的影响[J]. 金属热处理, 2023, 48(12): 7-12.
Xu Guifang, Liu Wentong, Zhang Bocheng, et al. Effect of heat treatment process on microstructure and mechanical properties of large size 1Cr17Ni2 steel[J]. Heat Treatment of Metals, 2023, 48(12): 7-12.
[6] 贾元伟. 退火工艺对热轧态含氮马氏体不锈钢420U6显微组织和硬度的影响[J]. 金属热处理, 2024, 49(3): 98-102.
Jia Yuanwei. Effect of annealing process on microstructure and hardness of hot-rolled 420U6 nitrogen-containing martensitic stainless steel[J]. Heat Treatment of Metals, 2024, 49(3): 98-102.
[7] 杨永红. 1Cr17Ni2钢热处理性能影响因素研究[J]. 金属制品, 2016, 42(4): 22-25.
Yang Yonghong. Influence factor research of 1Cr17Ni2 steel heat treatment property[J]. Metal Products, 2016, 42(4): 22-25.
[8] Zheng Y, Li N, Yan J, et al. The microstructure and mechanical properties of 1Cr17Ni2/QAl7 brazed joints using Cu-Mn-Ni-Ag brazing alloy[J]. Materials Science and Engineering A, 2016, 661: 25-31.
[9] 黄蓓, 郭占兵, 帅林涛, 等. 1Cr17Ni2铁素体含量的控制及其对性能的影响[J]. 失效分析与预防, 2021, 16(6): 398-401, 407.
Huang Bei, Guo Zhanbing, Shuai Lintao, et al. Control of ferrite content in 1Cr17Ni2 and its effect on mechanical properties[J]. Failure Analysis and Prevention, 2021, 16(6): 398-401, 407.
[10] Yang X, Zhang L, Zhang S, et al. Atmospheric corrosion behaviour and degradation of high-strength bolt in marine and industrial atmosphere environments[J]. International Journal of Electrochemical Science, 2021, 16(1): 151015.
[11] Hu C Y, Liu X L, Tao C H, et al. Failure analysis of stainless steel bolt[C]//2015 International Conference on Material Science and Applications. 2015: 932-936.
[12] 楚宝帅, 陈建礼, 李振江, 等. 碳氮含量对4Cr16NiMo钢淬火温度及耐蚀性能的影响[J]. 金属热处理, 2022, 47(12): 152-157.
Chu Baoshuai, Chen Jianli, Li Zhenjiang, et al. Effect of carbon and nitrogen content on quenching temperature and corrosion resistance of 4Crl6NiMo steel[J]. Heat Treatment of Metals, 2022, 47(12): 152-157.
[13] 夏书敏, 刘超英, 张贞明. 淬火与回火间的时效对1Cr17Ni2钢组织及屈服强度的影响[J]. 金属热处理, 2002, 27(7): 24-26.
Xia Shumin, Liu Chaoying, Zhang Zhenming. Effect of aging treatment between quenching and tempering on microstructure and yield strength of lCrl7Ni2 steel[J]. Heat Treatment of Metals, 2002, 27(7): 24-26.
[14] 蒋中华, 杜军毅, 王培, 等. M-A岛高温回火转变产物对核电SA508-3钢冲击韧性影响机制[J]. 金属学报, 2021, 57(7): 891-902.
Jiang Zhonghua, Du Junyi, Wang Pei, et al. Mechanism of improving the impact toughness of SA508-3 steel used for nuclear power by pre-transformation of M-A islands[J]. Acta Metallurgica Sinica, 2021, 57(7): 891-902.
[15] Zhang S, Wang P, Li D, et al. Investigation of the evolution of retained austenite in Fe-13%Cr-4%Ni martensitic stainless steel during intercritical tempering[J]. Materials and Design, 2015, 84: 385-394.
[16] 郝宪朝, 高明, 张龙, 等. 退火态12Cr13不锈钢显微组织及其对冲击韧性的影响[J]. 金属学报, 2011, 47(7): 912-916.
Hao Xianchao, Gao Ming, Zhang Long, et al. Microstructure of annealed 12Cr13 stainless steel and its effect on the impact toughness[J]. Acta Metallurgica Sinica, 2011, 47(7): 912-916.