通过热模拟压缩实验,开展了基于动态相变的热轧C-Mn-Si及C-Mn-Al-Si 系 TRIP钢组织及性能特征的研究. 结果表明, 通过动态相变, 可以使TRIP钢复相组织由细小铁素体晶粒、尺寸细小及位向混乱的贝氏体束、弥散分布的体积分数较高的颗粒状残余奥氏体等组成.由于铁素体、贝氏铁素体间的大量晶界、贝氏铁素体内的高位错密度以及铁素体晶粒间大量的细小颗粒状残余奥氏体,使实验钢具有连续屈服、屈强比低、强度较高及 塑性良好的特点. 其中, C-Mn-Si 钢的抗拉强度为890 MPa, 延伸率为26%; C-Mn-Al-Si 钢的强度为760 MPa, 延伸率为32%.
Abstract: The microstructure and mechanical properties of hot rolled C-Mn-Si and C-Mn-Al-Si TRIP(transformation induced plasticity) steels based on dynamic transformation of undercooled austenite (DTUA) were investigated by uniaxial hot compression tests on a Gleeble1500 simulation test machine. The results showed that in the multiphase microstructure of investigated steels, the grain size of ferrite was fine, the bainite packets was small and had chaotic orientations, the retained austenite distributed uniformly and had high volume fraction duo to the DTUA. Moreover in the microstructure, lots of grain boundaries of ferrite and bainitic ferrite, high density of desolation in bainitic ferrite and a high amount of granular retained austenite located among/between ferrites resulted in the steels having excellent mechanical properties, which was characterized by a combination of continuous yielding, high strength (～890MPa for C-Mn-Si steel and 760MPa for C-Mn-Al-Si steel) and high elongation(26% and 32% respectively )as well as low yield ratio.
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