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40铬钢表面加碳激光合金化处理
引用本文:魏仑,陈庆华,李俊昌,龙晋明,陈君才.40铬钢表面加碳激光合金化处理[J].激光技术,2002,26(1):1-3,8.
作者姓名:魏仑  陈庆华  李俊昌  龙晋明  陈君才
作者单位:1.昆明理工大学材料科学与工程系, 昆明, 650093;
基金项目:国家教委回国留学人员基金,原有色总公司回国留学人员基金资助项目
摘    要:对40铬钢进行表面加碳激光合金化处理,得到深0.25~0.35mm的白口铸铁层,白口铸铁层组织呈梯度变化,晶粒明显细化,显微硬度高达1200HV0.3以上.热影响相变区组织为马氏体,并存在有针状马氏体到隐晶马氏体的分层,硬度为710~780HV0.3,比常规淬火明显提高.采用高的激光密度、快的扫描速度,有助于晶粒的细化,从而使硬度提高.磨损实验表明,白口铁层的磨损性能比常规淬火样品提高约50%.

关 键 词:40铬钢    加碳激光合金化    白口铸铁    耐磨性
文章编号:1001-3806(2002)01-0001-03
收稿时间:2000/11/27

Laser surface alloying of 40Cr steel with carbon
Wei Lun ,Chen Qinghua ,Li Junchang ,Long Jinming ,Chen Juncai.Laser surface alloying of 40Cr steel with carbon[J].Laser Technology,2002,26(1):1-3,8.
Authors:Wei Lun    Chen Qinghua  Li Junchang  Long Jinming  Chen Juncai
Affiliation:Wei Lun 1,2,Chen Qinghua 1,Li Junchang 1,Long Jinming 1,Chen Juncai 1
Abstract:The 40Cr steel has been surface-alloyed with a pre deposited carbon powder layer by laser beam.White cast iron is obtained on the surface of the sample with a depth of 0.25~0.35mm.The microstructure of the melted zone is pre-dendrite and eutectic ledeburite whose size is obviously refined by the rapid quench.Its micro hardness can get up to 1200HV0.3.The microstructure of the heat-affected zone is martensite with two sub-layers,one of which is pin-like martensite and the other,no-pin martensite.It indicates that the higher the scanning speed and power density,the smaller the grain,and therefore the higher the micro hardness.The wear test shows that the wear resistance of the specimens has been encreased by 50% than the general quenched samples.
Keywords:40Cr  laser alloying with carbon  cast iron  wear resistance
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