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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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低碳钢超细晶铁素体的形成
Abstract:
？将含碳量(质量分数)为0.057%和0.18%的低碳钢在不同过冷度、变形温度、变形速率和变形量的条件下进行热模拟实验,研究了含碳量和热变形条件对超细晶粒形成的影响.结果表明,变形前快速冷却(20℃/s)至ar3以上附近温度并进行超过50%变形量的变形,能强烈促进过冷奥氏体形变诱发铁素体相变,铁素体在奥氏体晶内平行的变形带上形核,并发生动态回复和再结晶,从而使组织细化.形变诱发的相变过程由碳的扩散所控制,当钢的含碳量比较高时,小过冷度、大变形量和中等变形速率有利于铁素体相变,晶界碳化物的析出能够抑制铁素体晶粒的长大,因而高碳含量钢表现出更好的细化晶粒效果.
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