普碳钢中板表层组织超细化的变形机理
范建文,张维旭,代晓莉,谢瑞萍
摘要(Abstract)：
采用单向压缩热模拟试验进行了普碳钢中厚板表层组织超细晶化研究。材料奥氏体化后快速冷却到550~800℃范围内变形,结果表明,随着变形温度的升高,材料分别发生形变后铁素体静态再结晶、形变过程中的铁素体动态再结晶,形变诱导奥氏体-铁素体相变并获得超细晶粒铁素体。随着保温时间增加,形变诱导相变获得的铁素体逆相变为奥氏体。实验室轧制9mm钢板的铁素体晶粒度,轧后空冷达到11级(约7μm),与热模拟试验的结果相一致,轧后快冷铁素体晶粒进一步细化到12级(约5μm)。实验室条件下,钢板的屈服强度,轧后空冷接近350MPa,轧后快速冷却,能再提高90MPa左右,但断后伸长率明显下降。
关键词(KeyWords)： 普碳钢中板;超细晶粒铁素体;形变机理
基金项目(Foundation): 北京市科技新星计划资助项目(H013610320111)
作者(Author): 范建文,张维旭,代晓莉,谢瑞萍
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