通讯作者：Zicheng Zhang

发表刊物：Materials Characterization

卷号：94

影响因子：4.7

DOI码：10.1016/j.matchar.2014.05.020

摘要：Transformation-induced plasticity aided seamless steel tube comprising of ferrite, bainite, and metastable austenite was processed through forging, piercing, cold-drawing, and two-stage heat treatment T-shape hydroforming is a classic forming method for experimental research and practical production. The current work studied austenite-to-martensite transformation and microcrack initiation and propagation of the tube during T-shape hydroforming using electron backscattering diffraction, scanning electron microscopy, and transmission electron microscopy. The strain distribution in the bcc-phase and fcc-phase was studied by evaluating changes in the average local misorientation. Compared to the compressive stress, metastable austenite with similar strain surrounding or inside the grains transformed easier under tensile loading conditions. The inclusions were responsible for microcrack initiation. The propagation of the cracks is hindered by martensite/austenite constituent due to transformation induced plasticity effect. The volume fraction of untransformed retained austenite decreased with increase in strain implying transformation-induced plasticity effect. (C) 2014 Elsevier Inc. All rights reserved.

关键字：TRIP steel;Seamless steel tube;Hydroforming;Microstructure evolution;Retained austenite

论文类型：SCI JCR Q3

页面范围：149-160

是否译文：否