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本文通过考察不同温度与不同缺口角度,讨论了热模钢在热交变应力条件下的热疲劳行为。本文指出:(1)工作温度愈高,随着热循环次数增加而降低了强度与硬度,将导致碳化物集聚加快以及热疲劳加快。(2)缺口角度的大小对热疲劳十分敏感,角愈尖锐,使得应力集中愈严重和疲劳破坏愈快。试验结果表明,3Cr_2W_8V钢的耐热疲劳性优于5CrMnMo钢。
In this paper, the thermal fatigue behavior of hot-mold steel under the condition of thermal alternating stress is discussed by examining different temperatures and different notch angles. This paper points out: (1) The higher the working temperature, the lower the strength and hardness with the increase of the number of thermal cycles, the faster the carbide agglomeration will be and the faster the thermal fatigue will be. (2) the size of the notch angle is very sensitive to thermal fatigue, the more acute corner, making the more serious stress concentration and fatigue damage faster. The test results show that the thermal fatigue resistance of 3Cr_2W_8V steel is better than that of 5CrMnMo steel.