半钢轧辊表面激光合金化工艺与组织  

Study of Microstructure and Processing of Laser Alloying on Smil-steel Roller

作　　者：冯汉臣[1] 冯亮[1] 谭文龙[1] 吴听[1] 杨蜀敏[1] 刘其斌[1,2] 

机构地区：[1]贵州大学花溪新校区材料学院,贵州贵阳550003 [2]贵州省材料结构与强度重点实验室,贵州贵阳550003

出　　处：《模具工程》2012年第7期49-52,共4页Mould &Die Project

摘　　要：设计一种微米级的合金化陶瓷粉末，采用CO2激光器对半钢轧辊表面实施激光合金化处理。利用金相显微镜、XRD、显微硬度计对合金化层的显微组织、成分和硬度进行了研究。结果表明，在激光输出功率P=2．0KW。扫描速度V=5mm，s，光斑尺寸D=3mm的条件下进行激光合金化，合金化区的显微组织均匀、细化，合金化层组织主要是由Y-Fe、Fe（Ni，Cr）、（Fe，Cr）7C3、MoC、Fe2MoC、WC、sic等相组成，强化机制属于硬质相强化。合金化层平均硬度为基材区2．5倍以上。A kind of alloying ceramic powder was designed, and the roller was alloyed by CO2 laser. The microstructure and properties of roller alloyed by laser are investigated by means of OM, XRD, Micro-hardness Testing Machine. The main structure of laser alloying iron-base alloy is composed of the phase of v-Fe. Fe （Ni,Cr） . （Fe,Cr）7C3. MoC. Fe2MoC. WC. SiC etc. The strengthening mode is partieled reinforced mechanism. The experimental results indicate that microstructure of alloying layer is refined and the average value of micro-hardness of alloying layer is approximately 2.5 times larger than that of substrate. The optimized technological parameter is that laser output power is 2.2 kW ,the scanning speed is 5mm / s ,beam diameter is 3.0 mm.

关 键 词：激光合金化 轧辊 工艺参数 

分 类 号：TG174.445[金属学及工艺—金属表面处理]