材料期刊网，材料期刊，材料类期刊，材料期刊投稿

Based on dislocation reaction theory and Avrami equation, a constitutive equation model was developed to describe dynamic recovery and dynamic recrystallization during hot deformation of T122 heat resistant steel, which have taken the effect of dynamic strain aging into account. Uniaxial hot compression test had been carried out over a wide range of strain rate (001 to 10 s-1) and temperature (900 to 1200 ℃) with the help of Gleeble 3500. Obtained experimental data was applied to determine the material parameters in proposed constitutive equations of T122 steel, by using the non-linear least square regress optimization method. The calculated constitutive equations are quantitatively in good agreement with experimentally measured curves and microstructure observation. It shows that propose constitutive equation T122 steel is able to be used to predict flow stress of T122 steel during hot deformation in austenite temperature scope.

关键词: hot deformation , dislocation , constitutive equation , T122 heat resistant steel

冷轧变形量对304不锈钢力学性能的影响

周翠兰 , 刘红梅 , 白晋钢 , 聂志水 , 周禾丰 , 乔珺威

钢铁

研究304奥氏体不锈钢薄板的硬度随冷轧变形量的变化规律，为奥氏体不锈钢薄板工业生产提供指导。同时，采用金相显微镜、维氏硬度测量、X-射线衍射仪和透射电镜研究了不同变形量冷轧对304不锈钢显微组织和机械性能的影响。在室温对0.5mm厚退火板材进行冷轧，使冷轧变形量从10%增加到52%。结果表明，形变诱发马氏体相变是导致304不锈钢冷轧时产生加工硬化的主要原因，冷轧可以显著提高钢的强度和硬度。当冷轧变形至40%时，304不锈钢的维氏硬度是未变形时的2.2倍，屈服强度、抗拉强度分别增大到未变形时的4.2倍（880MPa）和1.8倍（1312MPa）。

关键词: 304奥氏体不锈钢薄板 , cold rolling , dislocation , work hardening , strain-induced martensitic transformation

异步轧制TWIP钢的力学性能和微观组织

蒋建华，丁毅 , ，陈云龙，单爱党

钢铁

利用金相显微镜、X射线衍射仪和透射电子显微镜对异步轧制及热处理TWIP钢的力学性能与微观组织进行了研究。结果表明，TWIP钢经500℃异步轧制后强度显著提高，而塑性降低，这是位错与孪晶共同作用的结果。轧制后的热处理降低了位错密度以及变形孪晶数量，导致强度降低，伸长率升高。经600℃和700℃退火后，TWIP钢表现出良好的强度和塑性综合性能。因此，异步轧制后热处理是获得具有优良综合力学性能TWIP钢的可行途径。

关键词: TWIP钢 , asymmetric rolling , mechanical property , dislocation , twin

材料期刊网

Constitutive Equation Models of Hot-Compressed T122 Heat Resistant Steel

冷轧变形量对304不锈钢力学性能的影响

异步轧制TWIP钢的力学性能和微观组织

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