表面脱碳层对H13钢热疲劳性能的影响

来源期刊：上海金属2011年第1期

论文作者：石楠楠 吴晓春 周青春

文章页码：26 - 29

关键词：H13钢； 表面脱碳； 热疲劳； 热作模具钢

Key words：H13 Steel； Surface Decarburization； Thermal Fatigue； Hot Working Die Steel

摘    要：主要研究了在自约束条件下,表面脱碳层对H13钢热疲劳性能的影响。结果显示,含脱碳层试样表面开裂严重,表层硬度急剧下降,热疲劳损伤因子大大高于半脱碳和无脱碳的试样。说明脱碳造成材料表层含碳量减少,强度降低,使热疲劳时产生的交变热应力超过材料的屈服强度,引起往复塑性变形,逐渐造成损伤累积,从而导致钢的热疲劳强度下降。

Abstract: The effect of surface decarbonization layer on thermal fatigue property of steel H13 under self restrained condition was studied.Results showed that the decarbonized layer featured with serious cracking and decline surface hardness,its thermal fatigue damage factor was higher than that of the other samples.This meant that the decarbonization made lower carbon content on steel surface and the reduced hardness.The stress induced by temperature exceeded the yield strength of steel during thermal fatigue process,which led to reciprocal plastic deformation,resulted in cumulative damage and deteriorated the thermal fatigue property of steel.