Optimizing the Morphology and Stability of Retained Austenite in a δ-TRIP Steel

被引：41
|
作者：
Yi, H. L. [1 ]
Chen, P. [1 ]
Bhadeshia, H. K. D. H. [2 ]
机构：
[1] Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110189, Peoples R China
[2] Pohang Univ Sci & Technol, Grad Inst Ferrous Technol, Pohang 790784, South Korea
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2014年 / 45A卷 / 08期
基金：
中国国家自然科学基金;
关键词：
TRANSFORMATION-INDUCED PLASTICITY; 1.2-PCT SI-1.5-PCT MN; 0.4C-1.5SI-0.8MN STEEL; MECHANICAL-PROPERTIES; 0.15-PCT-C STEELS; BAINITE; TEMPERATURE; REFINEMENT; ADDITIONS; STRESS;
D O I：
10.1007/s11661-014-2267-4
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
delta-TRIP is a low-alloy steel in which ferrite persists at all temperatures in the solid-state, with the remaining microstructure consisting of carbide-free bainite and carbon-enriched retained austenite. The present work explores for the first time, how changes in the intercritical annealing temperature and the transformation conditions associated with bainite influence the morphology and stability of the austenite, and hence the behavior of the microstructure during tensile deformation. It is found that the structure can be optimized to consist of a combination of blocky and film austenite that undergo transformation over a range of plastic strains, thus minimizing the possibility of plastic instabilities, and hence imparting considerable strength and uniform elongation.
引用
收藏
页码：3512 / 3518
页数：7
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