35CrMo钢高强度螺栓热处理工艺优化
Heat treatment process optimization of 35CrMo steel high strength bolt
吕明奎 1夏添 1张保耀 1杨东辉 1陈敬1
作者信息
- 1. 铁科(天津)科技有限公司,天津 301700
- 折叠
摘要
采用单因素法对35CrMo钢的热处理工艺进行了研究,并以心部硬度达到半马氏体硬度作为淬透依据,1/2半径和心部硬度作为评价指标,采用正交试验法对3种直径∅30、∅32和∅36 mm试样进行热处理工艺优化,以确定满足螺栓强度等级10.9级的适宜的热处理工艺参数.结果表明,优化的热处理工艺参数为淬火加热温度860℃,保温时间50 min,水溶性淬火液淬火,回火温度480 ℃,保温时间80 min.采用优化工艺热处理后,3种直径样品的硬度、抗拉强度、屈服强度、断后伸长率和断面收缩率均满足10.9级高强度螺栓力学性能要求.
Abstract
Orthogonal test method was used to optimize the heat treatment process for three kinds of specimens with diameters of ∅30,∅32 and ∅36 mm in order to determine the suitable heat treatment process parameters to meet the bolt strength grade 10.9,where the heat treatment process of 35 CrMo steel was investigated by using single-factor method,and that the hardness of the core reaching half martensite hardness was used as the basis for quenching,that the 1/2 radius and core hardness were used as the evaluation indexes.The results show that the optimal heat treatment parameters are the quenching temperature of 860 ℃,the holding time of 50 min,and the water-soluble quenching liquid for quenching,the tempering temperature of 480 ℃,and the tempering time of 80 min.After heat treatment with the optimized process,the hardness,tensile strength,yield strength,elongation and percentage reduction of area of all the specimens with three different diameters can meet the mechanical property requirements of 10.9 grade high strength bolts.
关键词
35CrMo钢/热处理工艺/硬度/高强度螺栓Key words
35CrMo steel/heat treatment process/hardness/high strength bolt引用本文复制引用
出版年
2024
NETL
NSTL
万方数据