50CrV钢螺丝刀刃口的激光淬火工艺优化与组织性能特征

doi:10.13251/j.issn.0254-6051.2020.07.014

金属热处理 ›› 2020, Vol. 45 ›› Issue (7): 68-72.DOI: 10.13251/j.issn.0254-6051.2020.07.014

50CrV钢螺丝刀刃口的激光淬火工艺优化与组织性能特征

崔陆军, 张猛, 郭士锐, 李晓磊, 崔英浩, 郑博, 曹衍龙, 曾文涵

中原工学院机电学院, 河南郑州 450007

收稿日期:2019-12-18 出版日期:2020-07-25 发布日期:2020-09-07
作者简介:崔陆军(1981—), 男, 教授, 博士, 主要研究方向为光纤传感及激光增材制造技术, E-mail:cuilujun@126.com
基金资助:
中原工学院自主创新应用研究项目(K2018YY001);河南省高等学校重点科研项目(19A460035,20A460033,20A460031);河南省科技攻关计划(202102210068)

Optimization of laser quenching process and characteristics of microstructure and properties of 50CrV steel screwdriver cutting edge

Cui Lujun, Zhang Meng, Guo Shirui, Li Xiaolei, Cui Yinghao, Zheng Bo, Cao Yanlong, Zeng Wenhan

School of Mechanical and Electrical Engineering, Zhongyuan University of Technology, Zhengzhou Henan 450007, China

Received:2019-12-18 Online:2020-07-25 Published:2020-09-07

摘要/Abstract

摘要： 为提高螺丝刀头刃口硬度与耐磨性,延长其使用寿命,在已做激光淬火薄壁件预试验基础上,采用大功率光纤耦合半导体激光器于螺丝刀刃口上进行激光淬火试验。利用光学显微镜、显微硬度计、摩擦磨损试验仪等试验测试仪器,分析刃口激光淬火区域组织形态特征、显微硬度及耐磨损性能,确定螺丝刀刃口激光淬火可行的工艺参数。试验结果表明:激光淬火后刃口由完全淬透区、过渡区、基材3部分组成,完全淬透区显微组织为针状马氏体与残留奥氏体,过渡区由马氏体与回火索氏体组成。刃口激光淬火合理工艺参数为激光功率600 W、扫描速度900 mm/min。激光淬火后刃口截面平均硬度为805.7 HV0.3,相对淬火前提高了177.4 HV0.3,表层硬度值达到816.7 HV0.3,相对淬火前提高了188.4 HV0.3。淬火后刃口表面磨损量为0.5 mg,为基材磨损量的27.8%,稳定摩擦因数为0.25,为基材稳定摩擦因数的65.8%。激光淬火工艺能有效提高螺丝刀刃口的显微硬度与耐磨性,可用于螺丝刀刃口表面性能强化。

关键词: 激光淬火, 螺丝刀刃口强化, 显微组织, 显微硬度, 耐磨性

Abstract: In order to improve the hardness and wear resistance of screwdriver head and prolong its service life, based on the pre-test of laser quenching thin-walled parts, laser quenching test was carried out on screwdriver cutting edge with high power fiber coupled semiconductor laser. Microstructure, microhardness and wear resistance of the laser quenched area of cutting edge were analyzed by means of optical microscope, microhardness meter and friction and wear tester, and the feasible process parameters of laser quenching for the screwdriver cutting edge were determined. The experimental results show that after laser quenching, the cutting edge consists of three parts: the completely hardened zone, the transition zone and the base material. The microstructure of the completely hardened zone is composed of needle-shaped martensite and retained austenite, and the transition zone is composed of martensite and tempered sorbite. The reasonable process parameters of the laser quenching for cutting edge are laser power 600 W and scanning speed 900 mm/min. After laser quenching, the average hardness of the edge section is 805.7 HV0.3, which is 177.4 HV0.3 higher than that before quenching; and the surface hardness value is 816.7 HV0.3, which is 188.4 HV0.3 higher than that before quenching. After quenching, the surface abrasion loss of the cutting edge is 0.5 mg, which is 27.8% of that of the substrate, and the stable friction coefficient is 0.25, which is 65.8% of that of the substrate. The laser quenching process can effectively improve the microhardness and wear resistance of the screwdriver cutting edge, and can be used to strengthen the surface performance of the screwdriver blade.

Key words: laser quenching, screwdriver cutting edge strengthening, microstructure, microhardness, wear resistance

中图分类号:

TG156.99

崔陆军, 张猛, 郭士锐, 李晓磊, 崔英浩, 郑博, 曹衍龙, 曾文涵. 50CrV钢螺丝刀刃口的激光淬火工艺优化与组织性能特征[J]. 金属热处理, 2020, 45(7): 68-72.

Cui Lujun, Zhang Meng, Guo Shirui, Li Xiaolei, Cui Yinghao, Zheng Bo, Cao Yanlong, Zeng Wenhan. Optimization of laser quenching process and characteristics of microstructure and properties of 50CrV steel screwdriver cutting edge[J]. Heat Treatment of Metals, 2020, 45(7): 68-72.

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50CrV钢螺丝刀刃口的激光淬火工艺优化与组织性能特征

Optimization of laser quenching process and characteristics of microstructure and properties of 50CrV steel screwdriver cutting edge

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