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Mechanics of Advanced Materials and Structures Volume 22, 2015 - Issue 7
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Original Articles

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
Pages 591-596 | Received 19 Dec 2011, Accepted 24 Apr 2013, Published online: 06 Mar 2015
 
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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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