摘要
利用CO2激光器对QT600球墨铸铁进行了激光淬火处理试验,用X-350A型X射线应力仪测定QT600激光淬火后的表面及其断面残余应力规律,分析了QT600激光淬火后的残余应力形成机理。试验结果表明,在CO2激光工艺参数为输出功率P=800-1200W、光斑直径=3.5-4.0mm、扫描速度V=6-8mm/s的条件下,QT600激光淬火后的残余应力均为压应力,其值在-250MPa以上。在QT600材料表面及断面上测定了Ψ=0°4、5°和90°方向上的残余应力,其值的变化范围小,表明淬火后材料组织结构比较均匀,无明显织构,有利于提高材料的使用寿命。
QT600 nodular cast iron was processed with laser quenching by using a CO2 laser. The distribution of residual stress on surface and in hardened layer of laser quenching sample were studied with a X-ray stress analyzer (X-350A type). The forming mechanism of the residual stress was discussed. The results show that the compressive residual stresses of the laser quenched sample is higher than- 250 MPa under quenching parameters of the power P = 800-1200 W, laser spot diameter Φ = 3.5-4.0 mm and scanning velocity V = 6-8 mm/s. The residual stresses on surface and in hardened layer of the sample at the directions of Ψ-0°, 45° and 90° were measured, respectively. The results show that no significant difference is observed for the residual stresses in different directions. It is indicated that there are no obvious texture in the laser quenched QT600 cast iron.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2006年第2期79-82,共4页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(50405035)
江苏省研究生创新计划(XM05-32
XM04-24)
关键词
QT600球墨铸铁
残余应力
激光淬火
X射线衍射
Cast iron
Hardening
Lasers
Mechanisms
Nodular iron
Quenching
Textures
X ray diffraction
作者简介
冯爱新（1970-）,男,江苏大学机械工程学院副教授,主要研究方向为激光加工与薄膜检测、模具设计与制造,已发表论文20篇,电话：0511-8797578,E-mail：aixfeng@ujs.edu.cn.
孔德军（1967-）,E-mail：kong-dejun@163.com,Tel：0511-8797898.通讯作者
