奥氏体-贝氏体球墨铸铁中有20—40％的奥氏体,在滚动接触疲劳过程中,表面层奥氏体仅有5—10％发生应力诱发马氏体相变,产生于未转变的奥氏体区中,这种相变对于表面硬度的提高贡献不大,对接触疲劳性能没有明显的影响。
20-40% austenite in austenitic-bainitic ductile nodular cast iron. During roiling contact fatiguing, only 5—10% of such austenite in surface layer may transform into stress-induced martensite in untransformed austenitic areas. The transformation seems to be slightly improved surface hardness and unaffected upon contact fatigue properties of the iron.
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