High-cycle fatigue behavior of TWIP steel with graded grains: breaking the rule of mixture

High-cycle fatigue behavior of TWIP steel with graded grains: breaking the rule of mixture

We report a method, named as T & A treatment, to improve the high-cycle fatigue (HCF) property of twinning-induced plasticity (TWIP) steel without sacrificing its ductility and work-hardening ability. A long-range gradient in grain size was obtained in the TWIP steel, whose HCF resistance is bet...

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Bibliographic Details
Main Authors: C.W. Shao, P. Zhang, X.G. Wang, Q. Wang, Z.F. Zhang
Format: Article
Language:English
Published: Taylor & Francis Group 2019-01-01
Series:Materials Research Letters
Subjects:
TWIP steel
T & A treatment
graded grain
fatigue strength
high-cycle fatigue
Online Access:http://dx.doi.org/10.1080/21663831.2018.1550822
Description
Summary:We report a method, named as T & A treatment, to improve the high-cycle fatigue (HCF) property of twinning-induced plasticity (TWIP) steel without sacrificing its ductility and work-hardening ability. A long-range gradient in grain size was obtained in the TWIP steel, whose HCF resistance is better than both coarse-grain and fine-grain steels, breaking the rule of mixture. The surprising HCF property of the graded grain structure is believed to originate from the large generation of geometrically necessary dislocations and the formation of hard core and soft shell construction during cyclic loading.
ISSN:2166-3831

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