摘要
对铌、钛微合金化低碳锰系汽车用低合金高强度钢的成分、控冷工艺对其组织与力学性能的影响进行了试验研究。结果表明:卷取温度降低,钢的强度上升,伸长率下降,组织由铁素体+珠光体向贝氏体、马氏体转变;高温卷取时铌、钒对强度的贡献较明显,低温卷取时碳的贡献较大;对含0.06%～0.11%碳的锰-铌-钛系低合金高强度钢,同一成分采用不同的控冷工艺可以达到S550MC 与 S700MC 两个级别的性能要求。
The effect of chemical compositions and cooling processes on microstructure and mechanical properties of low carbon and manganese containing niobium and titanium micro-alloyed advanced high strength low alloy steels for automobile were studied in laboratory. The microstructure changed from ferrite plus pearlite bainite and martensite, and the strength increased when the elongation decreased with the decreasing of coiling temperature. The strength increment of the sheet coiled at high temperature is much higher than that coiled at lower temperature due to the contribution of Nb and V, while the function of carbon went to the opposite. The two different strength class steels $550MC and ST00MC can be manufactured by different cooling processes with steel of the same chemical composition about 0. 06%--0. 11% carbon, and also manganese, niobium and titanium added.
出处
《机械工程材料》
CAS
CSCD
北大核心
2006年第12期11-13,18,共4页
Materials For Mechanical Engineering
关键词
低合金高强度钢
控轧控冷
分段冷却
high streugth low alloy steel（HSLAS）
controlled rolling and cooling
stepwise cooling process
