摘要
用42CrMoVNb钢研制了1300MPa级高强度螺栓,结合生产工艺对其主要力学性能进行了试验研究,对经不同表面处理的螺栓进行了残余应力测试,分析了残余应力对疲劳性能的影响。结果表明,1300MPa级高强度螺栓在热处理后滚丝对提高抗拉强度和降低缺口敏感性有利;表面经磷化处理和"达克罗"处理对抗拉强度和缺口敏感性没有影响,但降低螺栓表面滚压或滚丝的残余压应力并由此影响螺栓的疲劳性能,表面经磷化处理的螺栓疲劳性能优于表面经"达克罗"处理的螺栓。
The most newly developed high strength bolt steel 42CrMoVNb has been applied to manufacturing high strength bolt of 1 300MPa grade. Main mechanical properties linking up production process and residual stress for bolt rolling or threading have been tested. It is shown that the bolt threading after heat treatment improves tensile strength and notch sensitivity of bolt, but phosphating and 'Dacromet' protective coatings reduce residual stress for bolt rolling or threading so that the surface protective coatings affect fatigue property of bolt.
出处
《机械工程材料》
CAS
CSCD
北大核心
2003年第6期21-24,共4页
Materials For Mechanical Engineering
基金
国家"973""新一代钢铁材料的重大基础研究"基金资助项目(1998061503)
关键词
高强度螺栓
力学性能
疲劳性能
残余应力
high strength bolt
mechanical property
fatigue property
residual stress
