Equal channel angular pressing (ECAP) and post-ECAP heat treatment were conducted on a Fe-1.38Mn-0.67Si-0.56Al-0.014 Nb-0.18 C transformation-induced plasticity (TRIP) aided steel. The microstructure of unECAPed TRIP sample was mainly composed of polygonal ferrite, bainite, retained austenite (RA) and lath martensite, while lath martensite was not observed in ECAPed TRIP samples. The stability of retained austenite (RA) for unECAPed TRIP sample was mainly influenced by the carbon content in RA, while for ECAPed TRIP steel, it was dominated by the size of RA. Comparing the mechanical properties of the unECAPed samples with the ECAPed samples, the ultimate tensile strength (UTS) changed slightly, but the total elongation (TEL) increased from 25.6% to 39.8%. The 4 passes ECAPed TRIP sample exhibited excellent mechanical properties with the product of tensile strength and total elongation (PSE) of 29.4 GPa %, which was a consequence of TRIP effect and cooperative deformation of ferrite, bainite and austenite.

在Fe-1.38Mn-0.67Si-0.56Al-0.014 Nb-0.18 C相变诱导塑性（TRIP）辅助钢上进行等通道角挤压（ECAP）和ECAP后热处理。未ECAPED TRIP样品的显微组织主要由多边形铁素体，贝氏体，残余奥氏体（RA）和板条马氏体组成，而在ECAPed TRIP样品中未观察到板条马氏体。对于未ECAPed TRIP样品，残余奥氏体（RA）的稳定性主要受RA中碳含量的影响，而对于ECAPed TRIP钢，残余奥氏体的稳定性受RA尺寸的影响。比较未ECAPed样品和ECAPed样品的机械性能，极限拉伸强度（UTS）略有变化，但总伸长率（TEL）从25.6％增加到39.8％。