Rolling Temperature Tailoring of Nanocrystalline Phases and Tensile Properties of Exceptional Nanocrystalline/Microcrystalline 316L Stainless Steel

Rolling Temperature Tailoring of Nanocrystalline Phases and Tensile Properties of Exceptional Nanocrystalline/Microcrystalline 316L Stainless Steel
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纳米晶相的轧制温度调整和特殊纳米晶/微晶 316L 不锈钢的拉伸性能

DOI:
10.1002/srin.201700263
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发表时间:
2018-02
影响因子:
2.2
通讯作者:
Ma Fuliang
Ma Fuliang
中科院分区:
材料科学3区
文献类型:
--
作者:
Yuan Miwen;Han Yijun;La Peiqing;Wei Fuan;Ma Fuliang

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本研究研究了轧制温度对铝热反应法制备的纳米晶/微晶316L不锈钢纳米晶相和拉伸性能的影响。轧制实验首先在 1073°K 下进行 40% 的厚度减少,然后在 1073°K、973°K 和 873°K 的温度下进行 70% 的厚度减少。使用 X 射线衍射 (XRD) 和 SEM 来分析相的演变,并使用 TEM 来表征微观结构。当轧制温度为1073 K时,随着厚度减薄率的增加,初始纳米晶逐渐消失,并形成新的亚微米晶相。当伸长率单调增加至 24% 时,钢的强度先增加后减少。当轧制温度降低到873 K时,316L不锈钢获得典型的双峰组织,实现高强度和相当塑性的超平衡(σ0.2 = 702 MPa,EL. = 20%)。约50%的纳米晶粒分数是双峰晶粒尺寸316L不锈钢的优化结构。
The effects of the rolling temperature on nanocrystalline phases and tensile properties of nanocrystalline/microcrystalline 316L stainless steel, that is, fabricated by the aluminothermic reaction method are investigated in this study. The rolling experiments are first performed at 1073 K with 40% and then with a 70% thickness reduction at the temperatures of 1073, 973, and 873 K. X‐Ray Diffraction (XRD) and SEM are used to analyze the evolution of the phases, and the microstructure is characterized using TEM. When the rolling temperature is 1073 K, the initial nano‐grains disappears gradually with the increasing rate of thickness reduction and are followed by the formation of the new sub‐micro grain phase. While the elongation increase to 24% monotonically, the strength of the steels initially increases and then decreases. When the rolling temperature decreases to 873 K, 316L stainless steels obtain a typical bimodal structure and achieve a super balance of high strength and considerable ductility (σ0.2 = 702 MPa, EL. = 20%). The nano‐grain fraction of approximately 50% is the optimized structure for bimodal grain size 316L stainless steel.
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