【摘要】 热作模具钢的热疲劳性能近几十年来受到了人们极大的关注,但热疲劳性能的测试方法至今国内外还没有规范的标准方法。本文选择了五种不同冶炼工艺和成分微调的5CrNiMo型热模钢,加工成板状试样,对试样形状、加热速度、温度、加热和冷却时间,以及热裂纹测量位置等几个因素进行了研究。明确了各因素对热疲劳性能以及对试样氧化程度、塑性变形的影响,掌握了实现单一热疲劳裂纹的规律。本文研究提出的热疲劳性能的测试方法简便、准确,灵敏度高。更多还原

【Abstract】 The thermal-fatigue property of die steels has been emphasiing more and more recently but there hasn’t been a normal method for testing thermal-fatigue as a sdandard in the world. We selected five t5Cr Ni Mo steels which differ from steelmaking or composition in a little quantity and processed them as the plate specimens. It was researched that the elements such as the shape of specimens、the rate of heating、the time of heating and cooling、the upper temperature of heat-cool cycles and the position in specimons for measuring the thermal cracks are how to influence the oxidization and plastic deformation of specimens as well as the test results of the thermal-fatigue. The method adopted in this research is simplc. accurate and sensitive for testing the thermal-fatigue of die steels.更多还原