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Strong Interactions between Austenite and the Matrix of Medium-Mn Steel during Intercritical Annealing

机译：奥氏体与中临界退火期间奥氏体与中Mn钢基质的强相互作用

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摘要

The effects of heat treatment on the microstructure evolution was studied in regards to austenite nucleation and grain growth. It was found that the austenite nucleation and matrix recrystallization kinetics of samples annealed at 675 °C for different times were revealed, implying a strong interaction between the ferrite matrix and austenite. The recrystallization of the matrix during annealing provided favorable conditions for austenite nucleation and growth, and the formation of austenite during this process reduced the matrix recrystallization kinetics, thus delaying the recrystallization process of the matrix around the austenite grains. The statistical results for the austenite grain size under different annealing temperatures indicated that the average grain size of the austenite slightly increases with increasing of the annealing temperature, but the austenite with the largest grain size grows faster at the same temperature. This difference is attributed to the strict Kurdjumov Sachs (KS) orientation relationship (OR) between the austenite grains and the matrix, because the growth of austenite with a strict KS OR with the matrix is often inhibited during annealing. In contrast, the austenite maintains a non-strict KS OR with the matrix and can grow preferentially with increasing annealing temperature and time.
机译：关于奥氏体成核和晶粒生长研究了热处理对微观结构演化的影响。发现在675℃下退火的奥氏体成核和基质重结晶动力学被揭示不同时间，暗示铁氧体基质和奥氏体之间的强相互作用。在退火过程中基质的重结晶为奥氏体成核和生长提供了有利条件，并且在该过程中形成奥氏体的形成还原基质重结晶动力学，从而延迟了奥氏体晶粒周围基质的重结晶过程。不同退火温度下奥氏体晶粒尺寸的统计结果表明，随着退火温度的增加，奥氏体的平均晶粒尺寸略微增加，但具有最大晶粒尺寸的奥氏体在相同的温度下增长更快。这种差异归因于奥氏体谷物和基质之间的严格的Kurdjumov Sach（或）取向关系（或），因为在退火期间通常会抑制具有严格Ks或具有基质的奥氏体的生长。相反，奥氏体维持非严格的Ks或与基质，并且可以在增加退火温度和时间时优先生长。

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