硫化锰复合夹杂物对车轮钢疲劳性能的改善  

Improvement of the MnS composite inclusions on the fatigue behaviour of wheel steel

作　　者：郭俊波[1,2] 沈昶 陆强[1,2] GUO Junbo;SHEN Chang;LU Qiang(Technology Center,Maanshan Iron and Steel Co.,Ltd.,Maanshan 243000,China;Pivotal Components of Rail Transit Technology Innovation Center of Anhui Province,Maanshan 243000,China)

机构地区：[1]马鞍山钢铁股份有限公司技术中心,安徽马鞍山243000 [2]轨道交通关键零部件安徽省技术创新中心,安徽马鞍山243000

出　　处：《炼钢》2024年第5期104-110,共7页Steelmaking

摘　　要：开展了含Al_(2)O_(3)夹杂和MnS包裹Al_(2)O_(3)夹杂形成的MnS复合夹杂车轮钢疲劳性能的对比试验,研究了两种夹杂物对车轮钢疲劳性能的影响。此后,基于数值计算从材料内部相变残余拉应力和外力应力集中两个角度阐述了夹杂物对疲劳的影响机理。研究发现,MnS复合夹杂物降低了夹杂物与基体间的相变残余拉应力和外力应力集中,提高了夹杂物与基体间的变形协调能力,从而提高了疲劳裂纹萌生寿命。减小夹杂物尺寸会缓解其外力应力集中,相比于MnS复合夹杂,Al_(2)O_(3)夹杂物的直径变化更显著地影响其周围径向应力的分布。在夹杂物尺寸相近的情况下,含MnS复合夹杂物试样的疲劳寿命高于含Al_(2)O_(3)夹杂试样。In this study,a comparative experiment was conducted to investigate the fatigue behavior of wheel steel containing Al_(2)O_(3)inclusions and MnS composite formed through the envelopment of Al_(2)O_(3)inclusions by MnS.Subsequently,through numerical calculations,the mechanisms influencing fatigue due to inclusions were elucidated from two perspectives:the residual transformation-induced tensile stress within the material and the external stress concentration.The investigation results indicated that the MnS composite inclusions reduced the residual transformation-induced tensile stress and external stress concentration between the inclusions and the matrix.This led to an enhanced deformation coordination capability,resulting in an increased fatigue crack initiation life.Reducing the inclusion size alleviated the external stress concentration.Compared with the MnS composite inclusions,the diameter variation of Al_(2)O_(3)inclusions had a more significant affect on the distribution of radial stress around them.The specimen with MnS composite inclusions demonstrated a higher fatigue life compared to the one with Al_(2)O_(3)inclusions when they had comparable inclusion sizes.

关 键 词：车轮钢 夹杂物 疲劳性能 应力集中 残余应力 

分 类 号：TF762[冶金工程—钢铁冶金]