Microstructural Evolution and Mechanical Properties of 0Cr13 Ferritic Stainless Steel During the Process of Equal-Channel Angular Pressing

Chinese Journal of Materials Research

2012, Vol. 26

Issue (5): 503-510 DOI:

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Microstructural Evolution and Mechanical Properties of 0Cr13 Ferritic Stainless Steel During the Process of Equal-Channel Angular Pressing

YANG Muxin YANG Gang LIU Zhengdong WANG Chang LIU Baofeng HUANG Chongxiang

1.Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093
2.Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081
3.College of Architecture and Environment, Sichuan University, Chengdu 610065

Cite this article:

YANG Muxin YANG Gang LIU Zhengdong WANG Chang LIU Baofeng HUANG Chongxiang. Microstructural Evolution and Mechanical Properties of 0Cr13 Ferritic Stainless Steel During the Process of Equal-Channel Angular Pressing. Chinese Journal of Materials Research, 2012, 26(5): 503-510.

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Abstract

Microstructural evolution and mechanical properties of a solution-treated 0Cr13 ferritic stainless during the process of equal-channel angular pressing (ECAP) for 1–4 passes at room temperature were investigated. The results showed that the microstructural refinement of 0Cr13 steel during ECAP process presented as the grain subdivision by the induced deformation bands in mesoscale, and the crystal disintegration through dislocation segmentation model in microscale. As a result, a homogeneous ultrafinegrained structure developed in the 4-pass ECAP sample, and the corresponding average grain size is about 349 nm. Tensile and impact tests at room temperature showed that the strength of the tested steel increased and its ductility decreased after ECAP deformation for a single pass. However, further pressings
(2nd, 3rd and 4th) resulted in a certain degree of improvement in impact toughness with enhancing strength simultaneously. The impact toughness of the multi-pass (3 and 4 passes) samples approximately returned to about 30% of the pre-pressing level. The enhanced static toughness and the changes in fracture mechanism resulted from grain refinement and dynamic recovery are responsible for the improved impact toughness of the multi-pass ECAP samples.

Key words: metallic materials ferritic stainless steel equal-channel angular pressing (ECAP) microstructure mechanical properties

Received: 09 July 2012

ZTFLH:

TG146.2

Fund:

Supported by National Natural Science Foundation of China Nos.50971045 and 11172187, and Fundamental Research Funds for the Central Universities No.0212SCU04A05.

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