TSZ410铁素体不锈钢的高温力学性能试验

Experimental Investigation of Mechanical Properties of TSZ410 Ferritic Stainless Steel at Elevated Temperature

摘要:

通过对TSZ410铁素体不锈钢进行高温稳态试验研究，得到了高温下初始弹性模量、名义屈服强度、抗拉强度、断后伸长率等主要力学性能指标，对比分析了Rasmussen模型和Gardner模型，并基于Rasmussen模型，提出了TSZ410不锈钢硬化指数的计算公式，建立了高温应力-应变本构关系，并与Q235B、S30408奥氏体不锈钢、EN 1.4003不锈钢进行了对比，研究揭示了温度对其力学性能的影响规律。研究表明，TSZ410不锈钢的初始弹性模量、名义屈服强度、抗拉强度随着温度的升高而逐渐下降，特别是在400~700℃温度段的下降速度最为显著；温度700℃时，初始弹性模量约为常温下的40%，名义屈服强度和抗拉强度降为常温下的15%左右。TSZ410不锈钢在高温下强度损失明显大于Q235B，而刚度损失明显小于Q235B；在温度低于500℃时，TSZ410不锈钢的强度损失显著小于S30408奥氏体不锈钢；当温度高于500℃后，则相反。

Abstract:

By conducting a high-temperature steady-state test study on TSZ410 ferritic stainless steel， the main mechanical performance indicators such as elastic modulus， nominal yield strength， tensile strength， and elongation were obtained. The Rasmussen model and Gardner model were compared and analyzed. Based on the Rasmussen model， the calculation formula for the high-temperature stainless steel material hardening index was proposed and the high temperature stress-strain constitutive relationship of TSZ410 stainless steel was established. Compared with Q235B， S30408 austenitic stainless steel and EN 1.4003 stainless steel， the law of the effect of temperature on its mechanical properties was revealed. The results indicate that the initial elastic modulus， the nominal yield strength， and the tensile strength of TSZ410 stainless steel decrease gradually with the increase of temperature， especially in the temperature segment of 400℃ to 700℃， and the rate of decline is most significant. When heating temperatures are equal to 700°C， the elastic modulus is reduced to 40% of the normal temperature elastic modulus， and the nominal yield strength and tensile strength are reduced to about 15% of the nominal yield strength and tensile strength at room temperature. At a high temperature， the strength loss of TSZ410 stainless steel is larger than that of Q235B， while the stiffness loss is obviously less than that of Q235B. At a temperature below 500 ℃， TSZ410 stainless steel strength loss is significantly less than S30408 austenitic stainless steel， but when the temperature is higher than 500 ℃， the opposite is true.