二次碳化物特征调控及其对高碳高合金马氏体钢耐磨性的影响
Regulation of Secondary Carbide Characteristics and Its Effect on Wear Resistance of High Carbon High Alloy Martensitic Steel
蒋金哲 1刘越 1刘春明1
作者信息
- 1. 东北大学 材料科学与工程学院,辽宁 沈阳 110819
- 折叠
摘要
二次碳化物的尺寸、含量对高碳高合金马氏体钢的力学性能及耐磨性有着重要影响.本文采用扫描电子显微镜、透射电子显微镜和磨粒磨损实验等手段,研究了高碳高合金马氏体钢锻造及球化退火过程中二次碳化物的演变行为及其对高碳高合金马氏体钢力学性能及耐磨性的影响.结果表明:球化退火显著增加了锻造空冷态实验钢中二次碳化物的含量及尺寸;在奥氏体化过程中,二次碳化物通过钉扎晶界显著细化了奥氏体晶粒,同时二次碳化物的存在降低了马氏体中合金元素固溶量,进而有效提升了实验钢的冲击韧性.高硬度的微米级二次碳化物配合高韧性马氏体基体可有效阻碍磨粒切削并减轻磨损表面的微观断裂,进而提升实验钢的耐磨性.
Abstract
The size and content of secondary carbide have an important effect on the mechanical properties and wear resistance of high carbon high alloy martensitic steel.In this paper,the evolution behavior of secondary carbide during forging and spheroidizing annealing process were studied by scanning electron microscope and transmission electron microscope,and its effects on mechanical properties and wear resistance of high carbon high alloy martensitic steel were also studied with abrasion wear testing machine.The results show that spheroidizing annealing significantly increases the content and size of secondary carbide in forged and air-cooled steel.The secondary carbide refine the austenite grain size by pinning grain boundary and reduce the solid solution content of alloying elements in martensite,which effectively improves the impact toughness of experimental steel.The micron-sized secondary carbide and ductile martensite matrix hinder abrasive cutting and reduce the microscopic fracture on worn surface effectively,which improves the wear resistance of experimental steel.
关键词
高碳高合金马氏体钢/二次碳化物/硬度/冲击韧性/耐磨性Key words
high carbon high alloy martensitic steel/secondary carbide/hardness/impact toughness/wear resistance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据