论文部分内容阅读
设计了成分与SAF2205双相不锈钢中奥氏体相和铁素体相成分相近的单相奥氏体不锈钢和铁素体不锈钢,根据其应力-应变曲线,采用有限元方法,计算了双相不锈钢的应力-应变曲线,并与实测值进行对比,同时对奥氏体的体积分数和双相不锈钢中两相屈服强度之比(C*)等影响双相不锈钢力学性能的因素进行了讨论。由单相奥氏体和铁素体不锈钢的应力-应变曲线计算的双相不锈钢的应力-应变曲线和实测的双相不锈钢应力-应变曲线吻合很好,说明本文所建立的有限元模型正确。计算表明奥氏体体积分数对应力-应变曲线的弹性部分没有影响,而对塑性部分影响较大。在外应力作用下,随着奥氏体体积分数的增加,应变增加;不同奥氏体与铁素体屈服强度之比(C*)对应力-应变曲线弹性部分没有影响,而对塑性部分略有影响,在外加应力作用下,随着C*增加,应变增加。
The single-phase austenitic stainless steels and ferritic stainless steels with compositions similar to austenite phase and ferrite phase in SAF2205 duplex stainless steel were designed. Based on the stress-strain curves, the finite element method The stress-strain curves were compared with the measured values, and the factors influencing the mechanical properties of duplex stainless steel were also discussed, such as the volume fraction of austenite and the ratio of two-phase yield strength in duplex stainless steels (C *). The stress-strain curve of duplex stainless steel calculated from the stress-strain curve of single-phase austenite and ferritic stainless steel is in good agreement with the measured stress-strain curve of duplex stainless steel, indicating that the finite element model established in this paper is correct. The calculation shows that the volume fraction of austenite has no effect on the elastic part of the stress-strain curve, but has a greater influence on the plastic part. Under the external stress, the strain increases with the increase of the volume fraction of austenite. The ratio of different austenite to ferrite yield strength (C *) has no effect on the elastic part of the stress-strain curve, but slightly on the plastic part Under the influence of external stress, as C * increases, the strain increases.