铁基合金梯度熔覆工艺研究及熔覆层特性分析  

Study on Gradient Cladding Process of Fe Based Alloy and Analysis on Characteristics of Cladding Layer

作　　者：张德强[1] 考锡俊 ZHANG Deqiang KAO Xijun(School of Mechanical Engineering and Automation, Liaoning University of Technology, Jinzhou 121001, China)

机构地区：[1]辽宁工业大学机械工程与自动化学院,辽宁锦州121001

出　　处：《热加工工艺》2017年第2期151-154,共4页Hot Working Technology

基　　金：国家科技支撑计划项目(2012BAF12B08-5);辽宁省自然科学基金优秀人才培养项目(2015020170)

摘　　要：为了在H13钢表面获得显微硬度呈梯度分布的铁基合金熔覆层,试验选取了三种铁基合金粉末FJ-1粉末、铁基合金粉末1号和高铬铁基合金粉末逐层进行激光熔覆,并探究了每层熔覆时的工艺参数,最终获得了由三种粉末堆积成的铁基合金梯度熔覆层,并对熔覆层的表面硬度、结合状态、组织和显微硬度等进行了分析。结果表明,三种粉末逐层熔覆后的梯度熔覆层表现出了表面平整、表面硬度较高、内部组织无明显缺陷且层间结合紧密的特征。熔覆层顶层晶粒细小,夹层和底层晶粒逐渐变大,熔覆层与H13钢结合处呈现良好的冶金结合特性。各层的显微硬度由基体逐渐向顶层升高,呈明显的梯度分布,最终得到梯度熔覆层。In order to obtain Fe based alloy cladding layer on the surface of H 13 steel, whose microhardness presented gradient distribution, three kinds of Fe based alloy powders such as F J-1 powder, Fe based alloy powder No.1 and high chromium iron based alloy powder were selected and were coated by laser layer by layer in the test and then the technological parameters of each layer were explored. At last, Fe based alloy gradient coating layer was piled up by three kinds of powder. Accordingly, the surface hardness, bonding state, microstructure and microhardness of the cladding layer were analyzed. The results show that the gradient cladding layer after three kinds of powder＇s coating show the characteristics of fiat surface, higher surface hardness, and no obvious defects in the inner structure and the characteristic of the tightness between layers. The grains of the top layer of cladding layer were small, while ones of the inner layer and the bottom layer become bigger and bigger, and the combination of the cladding layer and H13 steel shows good metallurgical bonding properties. The microhardness of each layer gradually increases from matrix to the top layer with obvious gradient distribution. Finally, the gradient cladding layer can be obtained.

关 键 词：H13钢 铁基合金粉末 激光熔覆 梯度熔覆层 

分 类 号：TG174.4[金属学及工艺—金属表面处理]