金属学报  2008, Vol. 44 Issue (9): 1069-1075

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Al对过共析钢缓冷相变和过冷奥氏体动态相变组织的影响

陈伟;李龙飞;杨王玥;孙祖庆

北京科技大学新金属材料国家重点实验室

Dynamic Phase Transformation and Spheroidization of Cementite of Hypereutectoid Steel Containing Aluminum during Deformation

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北京科技大学

陈伟; 李龙飞; 杨王玥; 孙祖庆 . Al对过共析钢缓冷相变和过冷奥氏体动态相变组织的影响[J]. 金属学报, 2008, 44(9): 1069-1075 .
, , , . Dynamic Phase Transformation and Spheroidization of Cementite of Hypereutectoid Steel Containing Aluminum during Deformation[J]. Acta Metall Sin, 2008, 44(9): 1069-1075 .

摘要 参考文献 相关文章 Metrics 全文: PDF(2882 KB)   摘要: 利用Gleeble 1500热模拟试验机进行单轴热压缩实验, 研究了合金元素Al对过共析钢缓冷相变和 过冷奥氏体动态相变组织的影响. 结果表明: 在缓冷相变时, Al的加入抑制网状渗碳体形成, 细化珠光体 片层间距; 在过冷奥氏体形变过程中, 动态转变经历动态相变和相变所得珠光体中渗碳体球化及铁素体动 态再结晶等过程. 在动态相变过程中, 没有形成晶界网状渗碳体, 而直接产生珠光体. Al的加入使动态相变过程中奥氏体的稳定性提高、珠光体转变推迟, 进一步细化了珠光体片层间距. 在相变所得珠光体中渗碳体球化及铁素体动态再结晶的过程中, Al阻碍渗碳体粗化, 使渗碳体颗粒和铁素体晶粒尺寸细化. 关键词 ： 过共析钢,  缓冷相变,  过冷奥氏体动态相变     Abstract：The effect of Al on microstructure evolution of a hypereutectoid steel(0.97%C) during deformation of undercooled austenite was investigated by hot uniaxial compression tests. The results indicated that the dynamic transformation during deformation of undercooled austenite included dynamic phase transformation, spheroidization of cementite and dynamic recrystallization of ferrite. The proeutectoid cementites were formed during equilibrium transformation, while the proeutectoid cementites were restrained by deformation of undercooled austenite and the interlamellar spacing of pearlite was reduced. With the addition of Al of about 1 wt%, the proeutectoid cementites were restrained during equilibrium transformation and dynamic phase transformation, the stability of undercooled austenite during deformation was increased, retarding the formation of pearlite and the interlamellar spacing of pearlite was decreased. During the spheroidization of cementite and dynamic recrystallization of ferrite, the coarsening of cementite was restrained and the size of cementite and ferrite was refined by the addition of Al of about 1 wt%. 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