浸渍烧结法制备金刚石滚轮的开裂原因分析  

Analysis on cracking of diamond roller prepared by impregnation sintering

作　　者：宋子博 王智春[1,2] 吕贺增 SONG Zibo;WANG Zhichun;LÜHezeng(North China Electric Power Research Institute Co.,Ltd.,Beijing 100045,China;State Grid Jibei Electric Power Research Institute,Beijing 100045,China;Langfang Zengwei Diamond Tools Co.,LTD,Langfang 065399,China)

机构地区：[1]华北电力科学研究院有限责任公司,北京100045 [2]国网冀北电力有限公司电力科学研究院,北京100045 [3]廊坊增威金刚石工具有限公司,河北廊坊065399

出　　处：《粉末冶金工业》2022年第6期127-133,共7页Powder Metallurgy Industry

基　　金：国网冀北电力有限公司科技项目(52018K20007G)。

摘　　要：通过宏观检验、理化分析、残余应力测试等方法对浸渍烧结法制备金刚石滚轮的开裂原因进行分析与研究。结果表明:在大直径金刚石滚轮制备的过程中,受钢基体与浸渍烧结层的热膨胀差异影响,在其熔合区容易形成WC粉空洞,造成该区域力学性能的下降。此外,大直径金刚石滚轮熔合区的残余应力明显大于小直径金刚石滚轮熔合区残余应力,而采用回火热处理可有效降低大直径金刚石滚轮的残余应力。小直径金刚石滚轮在浸渍烧结制备时,熔合区不易形成WC粉空洞,焊接残余应力也较低,发生开裂的可能性较小。By macroscopic examination,physical and chemical analysis and residual stress test,the cracking causes of diamond roller prepared by impregnation sintering was analyzed and studied.The results show that during the manufacturing process of large-diameter diamond roller,the vacancy of WC powder is easy to form in the fusion area due to the difference of thermal expansion between steel matrix and impregnated sintering layer,resulting in the decline of mechanical properties in this area.In addition,the residual stress in the fusion zone of largediameter diamond roller is significantly greater than that of small-diameter diamond roller,and tempering heat treatment could effectively reduced the residual stress of large-diameter diamond roller.When the small-diameter diamond roller is prepared by impregnation sintering,fusion zone is hard to form the vacancy of WC powder,and the welding residual stress is also low,thus the possibility of cracking is low.

关 键 词：金刚石滚轮 WC粉 浸渍烧结 残余应力 回火处理 脆性断裂 

分 类 号：TH132.41[机械工程—机械制造及自动化] TQ163[化学工程—高温制品工业]