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通过热模拟压缩实验,研究了基于动态相变热轧C-Mn-Al-Si系TRIP钢塑性断裂后不同部位的组织。结果表明,实验钢组织中尺寸较大的残留奥氏体,在塑性过程中很快就会发生马氏体相变,从而导致孔洞或裂纹的起源或萌生;而且,裂纹的起源和扩展与组织的铁素体/残留奥氏体(马氏体)密切相关。减小残留奥氏体的晶粒尺寸,提高残留奥氏体的稳定性,不让其在形变初期快速转变为马氏体,有利于TRIP钢强度及塑性的提高。
By means of thermal simulation and compression experiments, the microstructures of different parts of the C-Mn-Al-Si TRIP steel after plastic fracture were studied based on the dynamic phase transformation hot rolling. The results show that the retained austenite with large size in the experimental steel will rapidly undergo martensitic transformation during the plastic process, resulting in the origin or initiation of pores or cracks. Moreover, the origin and expansion of the cracks and the organization The ferrite / retained austenite (martensite) are closely related. Reduce the grain size of retained austenite, improve the stability of retained austenite, and prevent it from rapidly changing to martensite during initial deformation, which is in favor of improving the strength and ductility of TRIP steel.