Cracking Analysis of H13 Steel Die Insert
Author of the article:JI Guoqiang;CAI Rong;GE Guiming;LUO Zhiqi;LIN Yingfei
Author's Workplace：Guangdong Institute of Analysis(China National Analytical Center,Guangzhou),Guangdong Academy of Sciences,Guangzhou 510070,China;Shaoguan NACC Collaborative Innovation Technology Co.,Ltd.,Shaoguan 512026,China;Guangdong Institute of Materials and Processing,Guangdong Academy of Sciences,Guangzhou 510650,China
Key Words：H13 steel die Inset liquation carbide segregation of elements fatigue fracture
Abstract：By means of spark direct reading spectrometer,energy spectrum analyzer,metallographic microscope and rockwell hardness tester,the chemical composition,microstructure and hardness of the failure parts of H13 steel die core were observed and detected,and the reason of the cracking of H13 steel die core was analyzed.The results show that due to the improper smelting of the core material in the early stage,there is a serious component segregation,resulting in the formation of liquid carbide;In the later heat treatment process,the tempering temperature of the die core is not enough to form coarse-grained tempering martensite structure and intercrystalline carbide,resulting in significantly increased brittleness of the die core,and the hardness of the core reaches 57.2 HRC,which is much higher than 47~49 HRC required by normal tempering structure.The transition arc at the root of the die core is not smooth,which leads to the macroscopic crack first generated from this part,and then the crack expands rapidly until the fracture.
