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首页> 外文期刊>Journal of Materials Engineering and Performance >Improvement of Mechanical Strength of a Hot-Worked Twinning-Induced Plasticity Steel through an Optimum Secondary Annealing Treatment
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Improvement of Mechanical Strength of a Hot-Worked Twinning-Induced Plasticity Steel through an Optimum Secondary Annealing Treatment

机译：通过最佳的二次退火处理改善热工作的孪生诱导塑性钢的机械强度

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The microstructure of the twinning-induced plasticity (TWIP) steel microalloyed by Ti (TWIP-Ti) exhibited a wide grain size distribution after applying a thermomechanical treatment. The presence of fine and coarsest grains affected mechanical twinning and properties. This research was directed toward elucidating the effect of an optimum secondary annealing treatment to produce a homogenous microstructure through the release of remnant energy stored during the hot deformation processing of a TWIP-Ti steel. A comprehensive analysis of the effect of annealing parameters on the microstructure and its enhanced mechanical properties in terms of grain size distribution, precipitation strengthening and annealing twin fraction was performed. The microstructural characterization included light optical microscopy and scanning electron microscopy (SEM). SEM line scans were performed to characterize precipitate particles found in the TWIP-Ti steel. Microhardness and tensile tests were performed on the base material (as-solution condition) and post-annealing samples. The Taguchi method was applied to optimize the annealing parameters. Furthermore, image processing was employed to quantify the grain size distribution and annealing twin fraction. The analysis results revealed that upon completion of the second stage of annealing treatment with the optimal parameters, the grain size heterogeneity decreased due to the effect of coarsest grain subdivision. The low SFE of the TWIP-Ti steel, homogenous grain size microstructure and precipitation strengthening produced yield strength and ultimate tensile strength increases of 27% and 8.5%, respectively. The homogenous grain size distribution had a more substantial effect on improving the mechanical properties than the annealing twin fraction.
机译：Ti（TWIP-Ti）微合金化的孪晶诱发塑性（TWIP）钢经热机械处理后，其显微组织呈现出较宽的晶粒尺寸分布。细晶粒和粗晶粒的存在影响机械孪晶和性能。本研究旨在阐明最佳二次退火处理的效果，通过释放TWIP Ti钢热变形过程中储存的残余能量来产生均匀的微观结构。从晶粒尺寸分布、沉淀强化和退火孪晶组分等方面综合分析了退火工艺参数对组织及其力学性能的影响。显微结构表征包括光学显微镜和扫描电子显微镜（SEM）。对TWIP Ti钢中发现的沉淀颗粒进行了SEM线扫描表征。对基材（作为溶液条件）和退火后样品进行了显微硬度和拉伸试验。采用田口方法对退火参数进行了优化。此外，还采用了图像处理技术来量化晶粒尺寸分布和退火孪晶分数。分析结果表明，在以最佳参数完成第二阶段退火处理后，由于最粗晶粒细化的影响，晶粒尺寸不均匀性降低。TWIP Ti钢的低SFE、均匀的晶粒尺寸组织和沉淀强化使屈服强度和极限抗拉强度分别提高了27%和8.5%。与退火孪晶组分相比，均匀的晶粒尺寸分布对提高力学性能有更显著的影响。

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