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| 1 | 高强Q&P钢中残留奥氏体的TRIP行为显示文摘用EBSD和XRD表征了Q&P钢不同应变量下的残留奥氏体(RA)演变情况,分析探讨了其演变机制。结果表明:淬火温度为200℃时,Q&P钢具有良好的综合力学性能,抗拉强度达到1605 MPa,伸长率达到12%。RA主要呈粒状均匀分布在铁素体和马氏体的边界处,尺寸在0.2~0.5μm。随变形的进行,RA的含量呈现逐渐降低的趋势,且前期的降低幅度较大;经8%的应变后,62%的RA发生了TRIP效应,应力也基本达到稳态值。试样拉断后,断口附近的RA含量约2.8%,整个单向拉伸过程68%的RA发生了TRIP效应。 | 田敬成 孙艳波 滕敦波 乔玉新 | 2019 | 金属热处理2019，44，7： | 3 |
| 2 | Prediction and Experimental Validation of Forming Limit Curve of a Quenched and Partitioned Steel显示文摘Forming limit curve(FLC)is an effective tool to evaluate the formability of sheet metals.An accurate FLC prediction for a sheet metal is beneficial to its engineering application.A quenched and partitioned steel,known as QP980,is one of the 3rd generation advanced high strength steels and is composed of martensite,ferrite and a considerable amount of retained austenite(RA).Martensite transformation from RA induced by deformation,namely,transformation induced plasticity(TRIP),promotes the capability of work hardening and consequently formability.Nakazima tests were carried out to obtain the experimental forming limit strains with the aid of digital image correlation techniques.Scanning electron microscopy(SEM)was employed to examine the fracture morphologies of Nakazima specimens of the QP980 steel.The observed dimple pattern indicated that tensile stress was the predominant factor which led to failure of QP980 specimens.Therefore,maximum tensile stress criterion(MTSC)was adopted as the forming limit criterion.To predict the FLC of QP980 steel,Von-Mises yield criterion and power hardening law were adopted according to the tested mechanical properties of QP980 steel.Results were compared with those derived from other three representative instability theories,e.g.Hill criterion,Storen-Rice vertex theory and Bressan-Williams model,which shows that the MTSC based FLC is in better agreement with the experimental results. | Xue-li GAO Jun-ying MIN Ling ZHANG Quan-chao LI Chang-wei LIAN Jian-ping LIN | 2016 | Journal of Iron and Steel Research(International)2016，23，6： | 1 |
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