Parameters of Simulated of Heat Treatment of Alloy Steel Containing Silicon
Author of the article:LIU Jie;CHENG Xiaole;QU Yinhu;FU Hanguang;ZHENG Shoudong
Author's Workplace：School of Mechanical and Electrical Engineering,Xi'an Polytechnic University,Xi'an710048,China;LiaoningZhongwang Machinery Equipment Manufacturing Co.,Ltd.,Liaoyang111000,China
Key Words：alloy steel equilibrium phase Si alloying CCT curve harden ability
Abstract：
Metallographic analysis and hardness test were performed on two kinds of silicon-containing wear-resistant alloy steels,namely,0.8 cr-2.2 mn-0.3 mo-1.0 si-0.004 b-0.45 c(1%Si steel)and 0.8 cr-2.2 mn-0.3 mo-2.0 si-0.004 b-0.45 c(2%Si steel).Phase transformation and mechanical properties of silicon containing alloy steel were calculated by using JMatPro simulation software of materials properties,and the equilibrium phase composition,continuous transformation curve(CCT)and hardenability curve(Jominy)of alloy steel were obtained.The results show that the critical austenitic temperature of 1%Si steel is AC3=754℃and AC1=695℃.The critical transition temperature of austenitization of 2%Si steel is AC3=780℃and AC1=717℃.When quenching cooling rate is 1℃/s or above,the quenching structure and mechanical properties of alloy steel tend to be stable,mainly martensite structure and residual austenite,and its mechanical properties are better.The martensite quantity decreases with the increase of the distance from quenching end face,the yield strength,tensile strength and hardness decrease obviously.At 0~2 cm away from the quenching end,the reduction tends to be flat,and at 2~10 cm away from the maximum reduction.
