Effect of prior hot rolling on the microstructures and mechanical properties of duplex stainless steel containing tempered martensite and ferrite |
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Authors: | Dong-Cherng Wen |
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Affiliation: | (1) Department of Mechanical Engineering, China Institute of Technology, 245, Yen-Chiu-Yuan (ACADEMIA) Road, Section 3, Nankang, Taipei, 11581, Taiwan, R.O.C |
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Abstract: | A duplex structure of δ-ferrite and lath martensite with interlath retained austenite film is developed in this study by modifying
the alloy addition. The presence of δ-ferrite can further strengthen the grain refinement of austenite during hot rolling.
As a result, the amount of retained austenite is enhanced. Tempered martensite embrittlement occurs due to the decomposition
of retained austenite, and grain refinement can in fact ameliorate the tempered martensite embrittlement by delaying the onset
of the embrittlement to a higher temperature. The combined effect of uniform and small grains as well as a large amount of
retained austenite provides a further increase in the mechanical properties. After identical tempering treatments, all mechanical
properties measured in the as-rolled condition were found to be higher than those of direct quenching without rolling. After
hot rolling, the increase in the hardness and tensile strength was not accompanied by a drop in the ductility and toughness. |
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Keywords: | duplex stainless steel hot rolling martensite grain refining mechanical properties |
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