基于金属-热-力耦合理论框架,利用DEFORM有限元分析软件建立了SDC99铣刀深冷处理多物理场耦合数值分析模型,探讨了深冷处理过程中铣刀内残留奥氏体的演变及分布规律,并借助X-ray衍射仪验证模拟结果.研究表明:淬火初始,铣刀中奥氏体的体积分数急剧下降,随着淬火时间的增加,奥氏体向马氏体的转变趋于平缓.淬火后,铣刀中残留奥氏体主要分布于刀刃根部附近和铣刀中空内圆柱面上,尤其是刀刃根部其残留奥氏体含量高达20％.进入深冷处理后,铣刀中的残留奥氏体继续向马氏体转变,与淬火初始相比,其奥氏体转变速率要小得多.深冷处理后,铣刀中残留奥氏体含量明显降低,其含量在3％以下,但仍主要聚集在刀刃根部.模拟结果与XRD定量分析结果比较吻合,验证了数值模拟的准确性和可靠性.
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