Abstract：Microstructure evolution of bainite non-quenched and tempered steel for automobile front axle during continuous cooling transformation was studied by DIL805L thermal dilatometer. The influences of alloy elements and cooling rate on the continuous cooling transformation curves， microstructure and micro-hardness of the steel were analyzed. The results show that alloy elements， such as Mn， Si， Cr， V and B in FAS2225 steel， were favorable for getting bainite in a wider range of cooling rate， and the transformation zones of pearlite and bainite were separated in the CCT diagram. Bainite can be obtained above the cooling rate of 0.1 ℃/s. With the increasing of cooling rates， the Vickers hardness of experimental steel increased， but the increase amplitude has changed significantly at the cooling rate of 0.1 and 2 ℃/s.
安治国，黄艳新，侯环宇，陈红卫，刘艳丽，史 远. 汽车前轴用贝氏体型非调质钢连续冷却转变[J]. 钢铁, 2016, 51(12): 70-73.
AN Zhi-guo，HUANG Yan-xin，HOU Huan-yu，CHEN Hong-wei，LIU Yan-li，SHI Yuan. Continuous cooling transformation of bainite non-quenched and tempered steel for automobile front axle. Iron and Steel, 2016, 51(12): 70-73.
ZHOU B, SHEN Y, Tan L, et al.Research on a new process of the non-quenched and tempered steel with high strength and high toughness[J].[J].Physics Procedia, 2013, (50):25-31
[3]
ZHOU B, SHEN Y, Tan L, et al.Research on a new process of the non-quenched and tempered steel with high strength and high toughness[J].[J].Physics Procedia, 2013, (50):25-31
Khodabandeh A R, Jahazi M, Yue S, et al.The determination of optimum forging conditions for the production of high strength-high impact toughness automotive parts[J].Materials and Manufacturing Processes, 2006, 21(1):105-110
[5]
Khodabandeh A R, Jahazi M, Yue S, et al.The determination of optimum forging conditions for the production of high strength-high impact toughness automotive parts[J].Materials and Manufacturing Processes, 2006, 21(1):105-110
2016, Vol. 51 
