Fracture Mode of Martensite-Austenite Constituents Containing Multiphase Steel Controlled by Microstructural and Micromechanical Aspects

Yuhui WangNational Key Laboratory of Metastable Materials Science & Technology, College of Material Science and EngineeringYanshan University, Qinhuangdao, China;National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, College of Mechanical EngineeringYanshan University, Qinhuangdao, ChinaCorrespondence[email protected]

Qingfeng WangNational Key Laboratory of Metastable Materials Science & Technology, College of Material Science and EngineeringYanshan University, Qinhuangdao, China

Ligang LiuNational Engineering Research Center for Equipment and Technology of Cold Strip Rolling, College of Mechanical EngineeringYanshan University, Qinhuangdao, China

Wenwen XuNational Key Laboratory of Metastable Materials Science & Technology, College of Material Science and EngineeringYanshan University, Qinhuangdao, China

Abstract

The fracture mode in different M-A constituents containing multiphase steels under impact load was examined considering their microstructural and micromechanical aspects. The results showed that a ductile fracture develops in the fine-grained bainitic ferrite/M-A multiphase by microvoids initiation and coalescence, while cleavage develops in the coarse-grained polygonal ferrite/M-A multiphase by microcracks initiation and propagation, due to their diversities in morphologies of microstructural components and microhardness difference between phases.

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Fracture Mode of Martensite-Austenite Constituents Containing Multiphase Steel Controlled by Microstructural and Micromechanical Aspects

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Fracture Mode of Martensite-Austenite Constituents Containing Multiphase Steel Controlled by Microstructural and Micromechanical Aspects

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