摘要
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Q370q E-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。Q370q E-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Q370q E相比较,Q370q E-HPS钢转变开始温度高。Q370q E-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。
Supercooled austenite transformation behavior of a newly developed Q370 q E-HPS steel during continuous cooling was investigated by Gleeble-1500 D thermal / mechanical simulation testing machine. The results show that the transformed microstructure is pearlite and ferrite when the cooling rate is slower than 5 ℃ / s; when the cooling rate is between 5 ℃ / s and 15 ℃ / s,the transformed microstructure is bainite and acicular ferrite. For the Q370 q E-HPS steel,the ferrite transformation temperature range is between 700 and800 ℃ and the bainite transformation temperature range is between 550 and 700 ℃,which has a high transformation start temperature than that of the conventional Q370 q E steel. The transformed microstructure is fine grained ferrite + pearlite for the Q370 q E-HPS steel grade after two stages deformation when the cooling rate is less than 5 ℃ / s,which can be taken as reference for controlled cooling.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第S2期94-98,共5页
Transactions of Materials and Heat Treatment
基金
CITIC-CBMM铌钢研究与开发基金(2014-D078-1)
