摘要
利用激光合金化技术在45钢表面制备了钼合金化层,并研究了合金化工艺对硬度的影响。结果表明:随着激光功率的增加,钼合金化层的硬度逐渐减小;随着激光扫描速度的增加,钼合金化层的硬度先升高后降低;随着预涂层厚度的增加,钼合金化层的硬度逐渐增加。45钢钼合金化的最佳工艺为:激光功率4.3kW、激光扫描速度8mm·s-1、预涂层厚度0.25mm。经该工艺处理后的钼合金化层分为合金化区和热影响区,合金化区厚度为805μm,组织为FeMo、Fe2Mo和Mo2C等相,平均硬度725HV0.1,热影响区厚度193μm,组织为马氏体和部分残余奥氏体,硬度从725HV0.1到203HV0.1,呈梯度分布。
The molybdenum alloying layer on the surface of 45 steels were prepared by laser alloying technology.The influence of alloying process on the hardness was studied.The results show that with the increase of laser power,the hardness of the molybdenum alloy layer gradually decreases.With the increase of laser scanning speed,the hardness of the molybdenum alloying layer increases first and then decreases.With the increase of pre-coating thickness,the hardness of the molybdenum alloying layer increases gradually.The optimum process of Mo alloying for 45 steel is laser power 4.3k W,laser scanning speed 8 mm·s-1,pre-coating thickness 0.25 mm,respectively.The molybdenum alloying layer after treated by the process consists of the alloying zone and heat affected zone.The alloying layer’s thickness is 805μm and its microstructure are Fe Mo,Fe2Mo,Mo2C phases and the average hardness is 725 HV0.1.The thickness of the heat affected layer is 193μm,the microstructure is martensite and partial residual austenite and the hardness ranges from 725 HV0.1 to 203 HV0.1,which is in gradient distribution.
作者
林基辉
李耀
杨梦梦
戴姣燕
陈垚
于静
陆瑞斌
徐璇
徐金富
LIN Jihui1, LI Yao2, YANG Mengmeng1, DAI Jiaoyan3, CHEN Yao1, YU Jing1, LU Ruibin3, XU Xuan3, XU Jinfu3(1. School of Materials Science and Engineering, Chang'an University, Xi'an 710061, China; 2. Gas Recovery Technology Research Institute, PetroChina Changqing Oilfield Branch Second Extraction Factor, Yulin 719000, China; 3. School of Materials and Chemical Engineering, Ningbo University of Technology, Ningbo 315211, Chin)
出处
《热加工工艺》
CSCD
北大核心
2018年第14期127-129,133,共4页
Hot Working Technology
基金
宁波市工业重大专项项目(201601ZD-A01085)
工业重大(重点)择优委托科技攻关项目(2016B10023)
关键词
激光合金化
钼合金化层
工艺参数
laser alloying
molybdenum alloying layer
process parameters