低碳低合金钢的连续冷却相变组织特征及其形成机制

材料工程, 2010, (8): 29-33. doi: 10.3969/j.issn.1001-4381.2010.08.008

低碳低合金钢的连续冷却相变组织特征及其形成机制

王立军 ^1, , 蔡庆伍 ^2, , 余伟 ^3, , 武会宾 ^4, , 雷爱娣 ^5,

1.北京科技大学,高效轧制国家工程研究中心,北京,100083

2.北京科技大学,高效轧制国家工程研究中心,北京,100083

3.北京科技大学,高效轧制国家工程研究中心,北京,100083

4.北京科技大学,高效轧制国家工程研究中心,北京,100083

5.北京科技大学,高效轧制国家工程研究中心,北京,100083

基金项目: "十一五"国家科技支撑计划资助项目(2006BAE03A06)

关键词：连续冷却相变 , 低碳 , 退化珠光体 , 针状铁素体 , 组织

Characterization and Formation Mechanism of Microstructures of Low Carbon Low Alloy Steel During Continuous Cooling Transformation

利用Formastor-Digital全自动相变仪测定低碳Mn,Ni,Mo,Cr,V,Ti等低合金化钢的静态CCT曲线,结合光学显微镜、透射电镜、显微硬度法分析冷却速率对相变组织演变规律的影响.结果表明:当冷速为0.03℃/s时,相变组织为多边形铁素体(PF)+珠光体(P);冷速为0.06℃/s时,出现退化珠光体(PD);冷速为0.29℃/s时,出现针状铁素体(AF);冷速为1.7℃/s时,组织为粒状贝氏体(GB)+板条贝氏体(LB);冷速为42℃/s时,出现马氏体(M).提出极低冷速下低碳钢中出现退化珠光体是由于多元低合金元素的耦合交互作用,引起碳活度的变化所致.针状铁素体在晶内形核并长大,对后续相变组织起到分割作用,利于细化组织.低碳钢中局部孪生马氏体的形成归因于淬透性元素聚集对钢局域相变切应力过大所致.

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