本文对40Mn2,40Mn2Mo及30CrMnSiNi2钢进行了冲击性能试验、低频内耗测定及透射电镜薄膜观察。结果表明,这几种钢高温回火脆的出现总是伴随着Koster峰的下降。高温回火脆的产生系由钢中α固溶体的时效现象所引起,沉淀出的Fe_3C(N)对位错有质点型强钉扎作用而使韧性下降。
The impact toughness, low frequency internal friction and TEM examination were tested for steels 40Mn2, 40Mn2Mo and 30CrMnSiNi2. Experimental results indicate that the appearance of high temperature temper brittleness in these steels seems to be always accompanied by the decrease of Koster peak heights. The mechanism of this phenomenon may be explained as the result of an aging process of α-α-solid solution with precipitation of Fe_3C(N)particles causing pinning of dislocations and thereby decreasing the impact toughness.
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