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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Strength of AISI 316L in torsion at high temperature
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Strength of AISI 316L in torsion at high temperature

机译：AISI 316L在高温下的扭转强度

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Hot torsion flow behaviour of 30 μm grained AISI 316L stainless steel was investigated in the range of temperatures 850-1100 ℃ with equivalent strain rates 0.0001-0.006 s~(-1). For temperatures higher than 900 ℃ the material presented an unusual linear relationship at low strains between equivalent stress, σ_(Eq), and equivalent strain, ε_(Eq), whilst at 850 ℃ a parabolic σ_(Eq)-ε_(Eq) relationship was observed. The flow behaviour of 100 μm grained AISI 316L stainless steel torsionally deformed at 1000 ℃ with equivalent strain rate of 0.006 s~(-1) was reported to follow the expected parabolic σ_(Eq)-ε_(Eq) relationship and produced a significantly higher flow stress than the 30 μm grained material (about 40% higher at 0.5 equivalent strain). In both materials an unusual grain shape evolution from pre-deformation equiaxed to rhomboidal was observed during torsion, which was rationalised [G. Angella, B.P. Wynne, W.M. Rainforth, J.H. Beynon, Acta Mater. 53 (2005) 1263] in terms of strain induced grain boundary migration (SIGBM) combined with the torsion stress field. A qualitative model is proposed to describe the flow behaviour of the AISI 316L stainless steel based on the unusual grain structure evolution and, in turn, on SIGBM.
机译：研究了30μm晶粒AISI 316L不锈钢在850-1100℃温度范围内的当量应变速率为0.0001-0.006 s〜（-1）时的热扭流动行为。在高于900℃的温度下，该材料在低应变时等效应力σ_（Eq）和等效应变ε_（Eq）之间呈现出不同寻常的线性关系，而在850℃时，抛物线σ_（Eq）-ε_（Eq）关系被观测到。据报道，100μm晶粒AISI 316L不锈钢在1000℃扭转变形，等效应变率为0.006 s〜（-1）时，其流动行为遵循预期的抛物线σ_（Eq）-ε_（Eq）关系，并产生了更高的流动应力要比30μm的颗粒材料（在0.5当量应变下高约40％）。两种材料在扭转过程中均观察到了从预变形等轴到菱形的异常晶粒形状演变，这是合理的[G. B.P.安吉拉Wynne W.M. J.H. Rainforth Beynon，Acta Mater。 53（2005）1263]结合了应变应力引起的晶界迁移（SIGBM）。提出了一个定性模型来描述AISI 316L不锈钢的流动行为，该模型基于不寻常的晶粒结构演变，进而基于SIGBM。

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