The critical factors governing mechanical properties in hot-rolled Fe-0.2C-11Mn-(0-6)Al TRIP steels and fracture behavior

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

卷:683

Article

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

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

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

关键词: Ultimate tensile strength;    Total elongation;    Fracture mode;    Dislocation slip;    TWIP effect;   

DOI  :  10.1016/j.msea.2016.11.101

来源: Elsevier

【 摘 要 】

In the present study, we fundamentally explore the reasons underlying mechanical property variation in hot rolled 11Mn transformation-induced plasticity (TRIP) steels with varying Al-content. With increase in Al content, the ultimate tensile strength CUTS) was decreased, while total elongation (TE) was increased. The variation in UTS was mainly associated with the fraction of constituent phases and stability of austenite, while the increase in total elongation (TE) with increase in Al-content was related to the increase in the fraction of ferrite. Moreover, the Al-free steel, quenched from intercritical region experienced brittle fracture. When the Al content was increased to 2 wt%, the total elongation increased to similar to 22-32% and is also attributed to TRIP effect. In 4Al steel, the tensile elongation was in the range of similar to 19-40%, and was associated with TRIP effect and cooperative dislocation slip. In 6Al steel, the cumulative contribution of transformation-induced plasticity (TRIP), twinning-induced plasticity (TWIP), and cooperative deformation of delta-ferrite led to high elongation of similar to 37-65%. The increase in the contribution of TRIP and TWIP with increase in Al-content led to dramatic change in the mode and characteristics of fracture.

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