摘要
借助扫描电镜、透射电镜等研究了奥氏体化温度与低温回火对低合金耐磨钢组织与磨粒磨损性能影响。结果表明,实验钢分别在860、890及920℃奥氏体化,淬火及200℃回火后得到的组织主要是板条马氏体组织和少量残留的奥氏体,基体中有球形纳米尺寸的(Ti,Nb,V)C和短棒状ε-Fe_(x)C。当实验钢的奥氏体化温度为860℃时,未溶解碳化物体积分数较高,阻碍奥氏体晶粒粗化,淬火得到的马氏体板条束尺寸更细小。实验钢硬度随着奥氏体化温度的增加呈逐渐下降的趋势。随淬火温度升高,硬度降低,磨损量增大,钢的耐磨损性能变差。磨损机制主要是塑性变形和凿削,在奥氏体化温度为860℃时,实验钢的耐磨损性能最优。
The microstructure and precipitates of low alloy wear-resistant steel after quenching at different austenitizing temperatures and tempering were studied by SEM and TEM,and the wear mass loss was measured by abrasive wear tester.The results show that the microstructure of the test steel after austenizing at 860℃,890℃,920℃then quenching and tempering at 200℃is mainly lath martensite and a small amount of residual austenite.There are nanosize(Ti,Nb,V)C carbides and ε-Fe_(x)C particles in the matrix.The size of martensite lath are fine for the steel austenited at 860℃ because there are more insoluble carbides in the matrix,which prevents austenitic grain coarsizening.The hardness of the test steel decreases gradually and the abrasive wear resistant changes worse with the increase of austenite temperature.The wear mechanism is mainly plastic deformation and cutting.When the austenization temperature is 860℃,the wear resistant property of the test steel is best.
作者
万欣
宋新莉
贾涓
潘子钦
葛锐
WAN Xin;SONG Xinli;JIA Juan;PAN Ziqin;GE Rui(State Key Laboratory of Refractory Materials and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)
出处
《热加工工艺》
北大核心
2025年第23期32-38,共7页
Hot Working Technology
基金
国家重点研发计划资助项目(2017YFB0305100)。
关键词
低合金耐磨钢
奥氏体化温度
磨损性能
析出相
low alloy wear resistant steel
austenitizing temperature
wear performance
precipitated phase
