Grajcar Adam, Kilarski Andrzej, Kozłowska Aleksandra, Radwański Krzysztof
Silesian University of Technology, Institute of Engineering Materials and Biomaterials, 18A Konarskiego Street, 44-100 Gliwice, Poland.
Opel Manufacturing Poland Sp. Z o.o., 1 Adama Opla Street, 44-121 Gliwice, Poland.
Materials (Basel). 2019 Feb 6;12(3):501. doi: 10.3390/ma12030501.
A microstructure evolution of the thermomechanically processed 3Mn-1.5Al type steel and mechanical stability of retained austenite were investigated during interrupted tensile tests. The microstructural details were revealed using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) techniques. It was found that the strain-induced martensitic transformation began in central regions of the largest blocky-type grains of retained austenite and propagated to outer areas of the grains as the deformation level increased. At rupture, the mechanical stability showed only boundaries of fine blocky grains of γ phase and austenitic layers located between bainitic ferrite laths. The effects of various carbon enrichment, grain size, and location in the microstructure were considered. The martensitic transformation progress was the highest at the initial stage of deformation and gradually decreased as the deformation level increased.
在间断拉伸试验期间，对经过热机械处理的3Mn-1.5Al型钢的微观结构演变以及残余奥氏体的力学稳定性进行了研究。使用扫描电子显微镜（SEM）、电子背散射衍射（EBSD）和透射电子显微镜（TEM）技术揭示了微观结构细节。结果发现，应变诱导马氏体相变始于残余奥氏体最大块状晶粒的中心区域，并随着变形程度的增加向晶粒外部区域扩展。在断裂时，力学稳定性仅表现为γ相细块状晶粒的边界以及位于贝氏体铁素体板条之间的奥氏体层。考虑了各种碳富集、晶粒尺寸以及微观结构中位置的影响。马氏体相变进程在变形初期最高，并随着变形程度的增加而逐渐降低。
