Mechanical properties and deformation behavior in hot-rolled 0.2C-1.5/3A1-8.5Mn-Fe TRIP steel: The discontinuous TRIP effect

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:673

Article

Li, Z. C.^1,2  Misra, R. D. K.²  Cai, Z. H.¹  Li, H. X.¹  Ding, H.¹ 

[1] Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China

[2] Univ Texas El Paso, Lab Excellence Adv Steel Res, Dept Met Mat & Biomed Engn, El Paso, TX 79968 USA

关键词: TRIP;    Mechanical properties;    Deformation behavior;    Carbon and manganese distribution;   

DOI  :  10.1016/j.msea.2016.07.023

来源: Elsevier

【 摘 要 】

Mechanical properties and deformation behavior have been studied in two hot-rolled 0.2C-1.5Al-8.5Mn-Fe (1.5Al steel) and 0.2C-3Al-8.5Mn-Fe (3Al steel) transformation induced plasticity (TRIP) steels, subjected to an optimized quenching and tempering (Q&T) treatment. The study indicated that 1.5Al steel was characterized by excellent combination of ultimate tensile strength (UTS) of 1373 MPa, tensile elongation (TE) of 31.8%, and UTS x TE of 43.6 GPa%, where the superior mechanical properties are mainly attributed to the discontinuous TRIP effect. In contrast, 3Al steel indicated lower UTS, but higher TE of 34.5%, which resulted from the discontinuous TRIP effect and the cooperative deformation of 6-ferrite. The discontinuous TRIP effect is a consequence of varying degree of stability of austenite, which results from different austenite grain size, non-uniform C-content and Mn-distribution in lath-like austenite and blocky austenite. (C) 2016 Elsevier B.V. All rights reserved.

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