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通过微拉伸、电子背散射(EBSD)、透射电子显微镜(TEM)等手段,研究了具有亚稳奥氏体相的节约型双相不锈钢在1 000~1 200℃范围内不同固溶温度下的组织与性能的演变规律;探讨了固溶温度对形变诱导塑性(TRIP/TWIP)的作用机制。结果表明,随着固溶温度的升高,抗拉强度与伸长率均先升高后降低,而亚稳奥氏体相比例由74%(1 000℃)降低到37%(1 200℃);1 050℃固溶时,试验钢表现出最佳综合性能,抗拉强度达到960 MPa,伸长率达到62%,强塑积达到60 GPa·%。在经拉伸变形的微观结构中形变诱导马氏体与形变孪晶共存,表明试验钢中亚稳奥氏体相的变形机制主要受TRIP及TWIP共同控制,从而导致其塑性变形过程呈现多阶段应变硬化特征,而钢中铁素体相的变形机制主要变形为位错的滑移。
By means of micro-stretching, electron backscatter (EBSD), transmission electron microscopy (TEM) and other means, the economical duplex stainless steel with metastable austenite phase has been studied in the range of 1000 ~ 1200 ℃ with different solution temperature The mechanism of solution temperature on the deformation-induced plasticity (TRIP / TWIP) was discussed. The results show that as the solution temperature increases, the tensile strength and elongation both increase and then decrease, while the proportion of metastable austenite decreases from 74% (1 000 ℃) to 37% (1 200 ℃ ). When the solid solution at 1 050 ℃, the test steel showed the best overall performance. The tensile strength reached 960 MPa, the elongation reached 62%, and the plasticized area reached 60 GPa ·%. Deformation induced martensite and deformation twins coexist in the tensile deformation microstructure, indicating that the deformation mechanism of the metastable austenite phase in the test steel is mainly controlled by TRIP and TWIP, resulting in a multi-stage plastic deformation process Strain hardening characteristics, and the deformation mechanism of the ferrite phase in steel is mainly the dislocation slip.