高性能桥梁钢Q370qE-HPS过冷奥氏体连续冷却相变行为

Transactions of Materials and Heat Treatment(2015)

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Abstract
利用Gleeble 1500D型数控动态热-力学物理模拟试验机,针对新近研发的Q370qE-HPS高性能桥梁钢进行了过冷奥氏体连续冷却相变行为研究.结果表明,当冷却速度小于5℃/s时,形成铁素体+珠光体组织,当冷却速度在8℃/s~15℃/s时,形成针状铁素体+贝氏体组织.Q370qE-HPS高性能桥梁钢铁素体转变温度区间为700~800℃,贝氏体转变温度区间为550 ~700℃,与传统正火工艺桥梁钢Q370qE相比较,Q370qE-HPS钢转变开始温度高.Q370qE-HPS钢两阶段变形后的冷速≤5℃/s时形成均匀细小的铁素体+珠光体组织,可作为控冷阶段的参考冷速.
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Key words
normalized Q370qE steel,Q370qE-HPS,bridge-building steel,CCT
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