Excellent low temperature superplasticity and its deformation mechanism in nano/ultrafine grained Fe–17Cr–6Ni stainless steel

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
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引用次数: 0

Abstract

Superplastic deformation typically occurs in non-ferrous metals at high temperatures, which results in severe surface oxidation and high energy consumption. In this study, we designed and manufactured a nano/ultrafine-grained stainless steel with a dual-phase microstructure that exhibits excellent low-temperature superplastic deformation capability. A maximum tensile elongation of approximately 500% was achieved when the tensile test was conducted at 700 °C with an initial strain rate of 5 × 10⁻⁴ s⁻1. Even after a 500% tensile elongation, the austenite grains in the gauge section of the tensile specimen still maintained an equiaxed grain shape, and the texture also weakened significantly, indicating that grain boundary sliding and grain rotation dominated the deformation process during superplastic flow. The outstanding superplasticity is mainly attributed to the dual-phase microstructure composed of nano/ultrafine austenite grains and martensite.

纳米/超细晶粒 Fe-17Cr-6Ni 不锈钢优异的低温超塑性及其变形机理
有色金属通常会在高温下发生超塑性变形,从而导致严重的表面氧化和高能耗。在这项研究中,我们设计并制造了一种具有双相微观结构的纳米/超细晶粒不锈钢,它具有出色的低温超塑性变形能力。在 700 ℃、初始应变率为 5 × 10-⁴ s-1 的条件下进行拉伸试验时,最大拉伸伸长率约为 500%。即使拉伸伸长率达到 500%,拉伸试样规整截面上的奥氏体晶粒仍保持等轴晶粒形状,纹理也明显减弱,这表明在超塑性流动过程中,晶界滑动和晶粒旋转主导了变形过程。突出的超塑性主要归因于由纳米/超细奥氏体晶粒和马氏体组成的双相微观结构。
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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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