Si对铸铁激光熔敷层抗裂性的影响  

EFFECT OF Si ON CRACK RESISTANCE OF LASER CLAD LAYERS OF GREY IRON

作　　者：栾景飞[1] 严密[1] 

机构地区：[1]浙江大学硅材料国家重点实验室,杭州310027

出　　处：《机械工程学报》2002年第10期69-73,共5页Journal of Mechanical Engineering

基　　金：国家自然科学基金(50171065);教育部博士点基金(2000033507);留学归国人员基金([2000]367资助项目。

摘　　要：通过控制熔敷层内Si质量分数,进而控制奥氏体相与渗碳体相体积分数来抑制熔敷层裂纹的产生。在抗裂性最佳激光熔敷工艺参数基础上,首次系统地在不预热情况下研究了冶金元素Si对熔敷层奥氏体体积分数及表面裂纹率的影响,揭示了熔敷层开裂的微观机制。最终得到可显著降低熔敷层开裂敏感性的新激光熔敷材料。Volume fractions of austenite and cementite in laser clad layers are adjusted through adjusting the mass fraction of Si to avoid the formation of cracks. Based on optimum parameters of laser processing to prevent cracks, effects of Si on the volume fractions of austenite, and on the ratio of surface cracking in laser clad layers are systematically investigated for the first time under the condition of no preheating. Cracking mechanisms is analysed. At last new cladding materials that can restrain cracking of laser clad layer is obtained.

关 键 词：抗裂性 激光熔敷层 裂纹 奥氏体 灰铸铁 硅 

分 类 号：TG163[金属学及工艺—热处理]