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| Microstructure failure in ferrite-martensite dual phase steel under in-situ tensile test |
| Rui-bin Gou1,2,3,Wen-jiao Dan1,3,Wei-gang Zhang1,3,Min Yu4,*,Chun-yu Zhang2,Yin-hu Qiao2, Lu Ma4 |
1 Department of Engineering Mechanics, Shanghai Jiao Tong University, Shanghai 200240, China
2 School of Mechanical Engineering, Anhui Science and Technology University, Bengbu 233100, Anhui, China
3 Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China
4 College of Architecture, Anhui Science and Technology University, Bengbu 233100, Anhui, China |
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Abstract To investigate microstructure failure in ferrite-martensite dual phase steel, in-situ observations were performed on multiple plate DP800 specimens during uniaxial tensile tests. Microstructure evolution of the observed region was investigated in details. The experimental data showed that micro-cracks in various regions differed in the initiation time, and micro-failures mainly occurred from the locations with typical characteristics of stress concentration (i.e. ferrite interiors, the interfaces of ferrite-martensite grains and the martensite-martensite interfaces). Growth of micro-crack generally experienced the following stages: cracking from martensite boundaries, tiny particles in ferrite interiors, or martensite interiors, propagating in ferrite, bypassing martensite boundaries, or passing through martensite-martensite interfaces, finally ending on martensite boundaries. Martensite was one important source of micro-failure and changed the propagation of micro-cracks significantly. Microstructure deformation was inhomogeneous in the stage of plastic deformation.
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Received: 02 August 2016
Published: 20 March 2017
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| Fund:Anhui University Provincial Natural Science Research Project |
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Corresponding Authors:
Ruibin GOU
E-mail: grb106@163.com
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2017, Vol. 24 
