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Effects of cold rolling deformation on microstructure, hardness and creep behavior of high nitrogen austenitic stainless steel |
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Abstract Effects of cold rolling deformation on the microstructure, hardness and creep behavior of high nitrogen austenitic stainless steel (HNASS) were investigated. Microstructure characterization showed that 70% cold rolling deformation results in significant refinement of the microstructure of this steel with its average twin thickness reducing from 6.4 μm to 14 nm. Nanoindentation tests at different strain rates demonstrated that the hardness of the steel with nano-scale twins (nt-HNASS) is about 2 times as high as that of steel with micro-scale twins (mt-HNASS). The hardness of nt-HNASS exhibits a pronounced strain rate dependence with a strain rate sensitivity (m value) of 0.0319, which is far higher than that of mt-HNASS (m =0.0029). nt-HNASS shows a more significant load plateaus and a higher creep rate than mt-HNASS. Analysis revealed that higher hardness and larger m value of nt-HNASS arise from stronger strain hardening role caused by higher storage rate of dislocations and the interactions of dislocations and high density of twins. More significant load plateaus and higher creep rate of nt-HNASS is due to the rapid relaxation of the dislocation structures generated during loading.
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Received: 09 August 2013
Published: 31 October 2013
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| Fund: ;National Natural Science Foundation of China No. 10974041 |
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Corresponding Authors:
Zhong-Hao JIANG
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Cite this article:
Effects of cold rolling deformation on microstructure, hardness and creep behavior of high nitrogen austenitic stainless steel Chin. Phys. B 0
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