采用DIL805L型膨胀仪研究了一种汽车前轴用贝氏体型非调质钢的连续冷却相变组织变化规律，分析了合金元素和冷却速度对CCT曲线、相变组织和显微硬度的影响。结果表明，锰、硅、铬、钒、硼等元素的加入使得贝氏体型非调质钢FAS2225珠光体和贝氏体转变曲线完全分离，可以在较宽的冷却速度范围内得到贝氏体组织，当冷却速度大于0.1℃/s时，均可获得贝氏体组织。随着冷却速度的提高，试验钢的显微硬度增大，当冷却速度为0.1以及2℃/s时，硬度增加的幅度发生明显改变。
Microstructure evolution of bainite non-quenched and tempered steel for automobile front axle during contin-uous 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.
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