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低碳鋼中超細鐵素體的長大傾向

Coarsening Tendency of Ultra-fine Ferrite in Low Carbon Steels

  • 摘要: 在熱模擬單向壓縮條件下考察了四個不同C,Mn含量的低碳鋼中通過形變強化相變產生的超細鐵素體在模擬卷取溫度下的長大傾向.結果表明,不同C,Mn含量的四種鋼中的超細鐵素體在-500℃的保溫0~10min過程中都很穩定,沒有明顯的長大過程,也未明顯觀察到鐵素體的靜態再結晶.超細鐵素體穩定的主要原因是由于穩定的第二組織(珠光體或滲碳體顆粒)的有效釘扎,它既阻止了鐵素體的明顯長大,也抑制其靜態再結晶的充分進行.但不同C,Mn含量的四種鋼中的第二組織有不同的演變規律,保溫過程中形變奧氏體內形成離異珠光體并緩慢粗化.另外,利用背散射電子衍射取向成像技術還測定了08鋼保溫過程中的取向(差)變化.

     

    Abstract: The coarsening tendency of ultra-fine ferrite grains produced by deformation-enhanced transformation was investigated at simulated coiling temperatures by thermal simulating tests in four low carbon steels containing different C and Mn contents. Results show that the ultra-fine microstructures are quite stable. No apparent coarsening and static recrystallization of ferrite grains were detected and they are ascribed to the effective pinning by the second/minor phases. The evolution of second phases in four steels was different. During holding at coiling temperatures the transformation of austenite to perlite proceeded in a divorced manner owing to the strong deformation of austenite. Orientation mapping in EBSD measurements was also applied to reveal the changes of (mis)orientations of ferrite grains during holding.

     

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