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

金属学报, 2008, 44(9): 1069-1075. doi: 10.3321/j.issn:0412-1961.2008.09.008

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 ^1, , 李龙飞 ^2, , 杨王玥 ^3, , 孙祖庆 ^4,

1.北京科技大学新金属材料国家重点实验室,北京,100083

2.北京科技大学新金属材料国家重点实验室,北京,100083

3.北京科技大学材料科学与工程学院,北京,100083

4.北京科技大学新金属材料国家重点实验室,北京,100083

基金项目: 高等学校博士学科点专项科研项目(20050008017) 国家自然科学基金(50471092)

关键词：过共析钢 , 缓冷相变 , 过冷奥氏体动态相变 , Al , 渗碳体

EFFECTS OF ALUMINUM ON THE MICROSTRUCTURES OF TRANSFORMATION DURING SLOW COOLING AND DYNAMIC PHASE TRANSFORMATION OF UNDER-COOLED AUSTENITE OF HYPEREUTECTOID STEEL

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,使渗碳体颗粒和铁索体晶粒尺寸细化.

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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

EFFECTS OF ALUMINUM ON THE MICROSTRUCTURES OF TRANSFORMATION DURING SLOW COOLING AND DYNAMIC PHASE TRANSFORMATION OF UNDER-COOLED AUSTENITE OF HYPEREUTECTOID STEEL

参考文献