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Deformation behavior and the Portevin-Le Chatelier effect in a modified 18Cr-8Ni stainless steel

机译:改性18Cr-8Ni不锈钢的变形行为和Portevin-Le Chatelier效应

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Mechanical behavior and microstructural evolution of a 2.5%W + 0.4%Nb + 0.3%V + 0.17%N modified 18Cr-8Ni austenitic steel was studied in the temperature interval 410-740 "C at initial strain rates ranging from 6.7 × 10~(-6) to 1.3 × 10~(-2) s~(-1). The Portevin-Le Chatelier (PLC) effect attributed to dynamic strain aging (DSA) was found to occur in the temperature range 530-680 C The PLC effect is manifested in the form of serrated (jerky) flow and planar slip. DSA increases yield strength, σ_0.2 and ultimate tensile strength, σ_(tuts). in comparison with conventional SUS304 steel due to the additional alloying that provides the formations of the clouds of solutes around the dislocations that exert the solute drag force.
机译:研究了2.5%W + 0.4%Nb + 0.3%V + 0.17%N改性的18Cr-8Ni奥氏体钢的力学行为和微观结构演变,研究温度为410-740“ C,初始应变率为6.7×10〜( -6)至1.3×10〜(-2)s〜(-1),发现动态应变老化(DSA)引起的Portevin-Le Chatelier(PLC)效应发生在530-680 C的温度范围内效果以锯齿状(急动)流动和平面滑移的形式表现出来,与传统的SUS304钢相比,DSA与常规SUS304钢相比,增加了屈服强度σ_0.2和极限抗拉强度σ_(tuts),这是由于额外的合金化提供了位错周围的溶质云团会施加溶质阻力。

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