回火工艺对制动杠杆用17Cr16Ni2不锈钢螺栓力学性能的影响  

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

作　　者：李艳军 陈波 张亚楠 董晨曦 李雄兵[2] Li Yanjun;Chen Bo;Zhang Yanan;Dong Chenxi;Li Xiongbing(Henan Aerospace Precision Machining Co.,Ltd.,Xinyang Henan 464000,China;School of Traffic and Transportation Engineering,Central South University,Changsha Hunan 410075,China)

机构地区：[1]河南航天精工制造有限公司,河南信阳464000 [2]中南大学交通运输工程学院,湖南长沙410075

出　　处：《金属热处理》2025年第4期174-179,共6页Heat Treatment of Metals

基　　金：河南省紧固连接技术重点实验室开放课题(JGLJ2310)。

摘　　要：列车制动杠杆用17Cr16Ni2不锈钢螺栓在服役过程中,不仅要求螺栓具备较好的拉伸性能,同时也要求具有良好的冲击性能。回火工艺是调控和改善17Cr16Ni2不锈钢材料力学性能的关键。设计了不同的回火处理工艺,通过拉伸试验和冲击试验测试了回火处理后试样的拉伸性能和冲击吸收能量,并对组织和冲击断口形貌进行了观察。结果表明,两次回火处理在保证17Cr16Ni2不锈钢螺栓拉伸性能的同时,可显著提高其冲击性能。17Cr16Ni2不锈钢螺栓合适的热处理制度为:1000℃×180 min淬火+635~650℃一次回火+600~620℃二次回火,经该工艺处理螺栓的抗拉强度达910.0~957.0 MPa,屈服强度为746.5~829.0 MPa,室温冲击吸收能量最高可达50 J,远超设计技术要求。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.

关 键 词：制动杠杆 17Cr16Ni2不锈钢螺栓 回火处理 拉伸性能 冲击吸收能量 

分 类 号：TG156.5[金属学及工艺—热处理]