双金属层堆焊法制备铸钢基体大型锻模  

Large forging die manufactured with dual hardfacing metal layer on cast steel matrix

作　　者：卢顺[1] 周杰[1] 李梦瑶[1] 丁永峰[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《金属热处理》2013年第10期58-61,共4页Heat Treatment of Metals

基　　金：国家科技部重大专项项目(G09003.8-1);国家自然科学基金面上项目(51275543)

摘　　要：采用在铸钢基体上堆焊双金属层(过渡层和强化层)的方法设计与制造大型或超大型模锻液压机锻模。用MDS金相显微镜、SEM电子扫描显微镜、显微硬度测和试落锤冲击实验技术对铸钢ZG310-570双层堆焊试样进行了分析。结果表明,过渡层中含有的大量细小针状铁素体能提高模具韧性并改善强度,防止裂纹产生,并且有效地将表面强化层与铸钢基体层结合在一起,使整个试样的力学性能、硬度等呈逐步提高趋势,使过渡层具有良好的塑韧性。将该方法运用到40 MN热模锻压机用锻模的实际生产中,成功生产合格锻件7166件,模具寿命提高50%,成本降低20%。The die manufacturing method , which takes special cast steel as the die base and dual hardfacing layer （ the transition layer and strengthening layer ） are welded on the working area of the cast steel , was proposed to design and manufacture the large forging die .The dual hardfacing metal layer welding is performed , and then the microstructure of samples is analyzed by optical microscope and SEM .The hardness, impact properties and impact fracture of welding and substrate are measured .The results show that in the transition layer there is mainly fine acicular ferrite which enforces the toughness and strength of die , and prevent increases the crack .The strengthening layer is combined with substrate for the transition layer exists .In this method, the mechanical properties , hardness is gradually slowly , and meet the operating requirements for forging die .The service life of the forging die on the 40 MN hot die forging press is 7166 , and increase 50%, the cost decrease 20%compared with the traditional die manufacturing method .

关 键 词：大型锻模 铸钢基体 双金属堆焊层 

分 类 号：TG115[金属学及工艺—物理冶金]