5CrNiMo芯棒接长杆断裂失效分析  

Analysis of Fracture Failure of 5CrNiMo Mandrel Connecting Long Rod

作　　者：何智慧 郭洪飞[2,3] 王克山[4] 许琦 赵增祺 周弈 张永衡[3] 陈敏诗 HE Zhihui;GUO Hongfei;WANG Keshan;XU Qi;ZHAO Zengqi;ZHOU Yi;ZHANG Yongheng;CHEN Minshi(Zhuhai Hengqin Building & Construction Quality Inspection Centre Co., Ltd., Zhuhai 519031, China;School of Materials, Inner Mongolia University of Technology, Hohhot 010051, China;Institute of Physical Internet, Jinan University,Zhuhai 519070, China;Guangdong FUWA Engineering Manufacturing Co., Ltd., Jiangmen 529147, China)

机构地区：[1]珠海市横琴新区建设工程质量检测中心有限公司,广东珠海519031 [2]内蒙古工业大学材料学院,内蒙古呼和浩特010051 [3]暨南大学物联网与物流工程研究院,广东珠海519070 [4]广东富华铸锻有限公司,广东江门529147

出　　处：《热加工工艺》2019年第14期175-177,180,共4页Hot Working Technology

基　　金：中央高校基本科研业务费专项资金资助项目(21618412);内蒙古自治区科技创新引导奖励资金项目(103-413193)

摘　　要：断裂芯棒接长杆所用材料为5CrNiMo热作模具钢。通过断口宏微观观察、化学成分、力学性能检测、金相检验和能谱分析等试验,确定芯棒接长杆的断裂性质及断裂原因。结果表明:芯棒接长杆的失效性质为脆性断裂,芯棒接长杆没有经过调质处理,致使该材料部分力学性能结果不符合要求,同时S、Cr、C元素含量高于技术要求,杂质元素易在晶界上偏聚造成沿晶弱化,从而加速断裂。The material of the fracture mandrel connecting long rod is 5CrNiMo hot working die steel. The fracture properties and fracture reasons of the mandrel connecting long rod were determined by means of macro-microcosmic observation, chemical composition, mechanical property testing, metallographic examination and energy spectrum analysis.The results show that, the failure property of mandrel connecting long rod is brittle fracture, and the mandrel connecting long rod has not been quenched and tempered, some mechanical properties of the material do not meet the requirements. At the same time, the content of S, Cr and C elements is higher than the technical requirements, and impurity elements tend to segregate on grain boundaries and cause intergranular weakening and accelerate the fracture.

关 键 词：芯棒接长杆 5CrNiMo 脆性断裂 调质处理 

分 类 号：TGI11.91[金属学及工艺]