S32001双相型不锈钢高温力学性能试验

Experimental Investigation on Mechanical Properties of S32001 Duplex Stainless Steel at Elevated Temperatures

摘要:

对S32001双相型不锈钢进行了高温稳态拉伸试验研究，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及其变化规律；利用试验数据研究了Rasmussen模型和Gardner模型的适用性，并基于Rasmussen模型提出了S32001不锈钢硬化指数的计算公式，建立了高温下不锈钢材料本构关系表达式；对比分析了S32001不锈钢与其他种类不锈钢及Q235B结构钢的高温力学性能。研究表明，S32001不锈钢的屈服强度和极限强度随温度升高下降，600 ℃时低于常温时的50 %，但高温下材料强度明显高于S30408不锈钢，具有更加优越的抗火性能。该研究结果可用于结构受火性能研究和抗火设计。

Abstract:

In this paper， a high-temperature steady-state tensile test study of S32001 duplex stainless steel was conducted， and the main mechanical property indexes such as initial modulus of elasticity， nominal yield strength， tensile strength and elongation after fracture， etc. at elevated temperatures were obtained. The applicability of the Rasmussen model and the Gardner model was studied using the test data. Based on the Rasmussen model， the calculation formula of the hardening index of S32001 stainless steel was proposed， and the constitutive relation expression at elevated temperatures was established， while the mechanical properties of S32001 stainless steel at elevated temperatures were compared and analyzed with other types of stainless steel and Q235B structural steel. The study shows that the yield strength and ultimate strength of S32001 stainless steel decreases with the increase of temperature， which is lower than 50 % at room temperature at 600 °C， but the material strength at elevated temperatures is significantly higher than that of S30408 stainless steel， which has more superior fire resistance properties. The results of this paper can be used in the study of structural fire performance and fire resistance design.