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采用电子显微镜、X-射线衍射仪金相显微镜和万能材料试验机及JMat Pro软件模拟平衡合金相图、CCT和TTT曲线等,研究SAF2507超级双相不锈钢在不同热成形工艺条件下析出相的析出规律以及析出相与力学性能的关系。结果表明:热成形温度为950℃时,在铁素体和奥氏体相界析出σ相,随着热成形温度的升高,σ相逐渐溶解,铁素体含量上升,奥氏体含量下降,SAF2507超级双相不锈钢的抗拉强度和硬度呈现先急剧下降后缓慢升高的规律,而延伸率和冲击功呈现先急剧升高后缓慢下降的规律;当热成形温度为1 050℃时,出现综合力学性能变化的拐点,此时材料的抗拉强度为860 MPa,显微硬度为26.9 HRC,延伸率为37.6%,冲击功为148 J。
The precipitation of precipitated phases of SAF2507 super duplex stainless steel under different thermoforming conditions was studied by using electron microscope, X-ray diffraction metallography and universal testing machine and JMat Pro software to simulate the equilibrium alloy phase diagram, CCT and TTT curves. Law and the relationship between precipitation phase and mechanical properties. The results show that σ phase precipitates at the interface between ferrite and austenite at 950 ℃, and the σ phase dissolves gradually with the increase of the hot forming temperature. The ferrite content increases and the austenite content decreases , The tensile strength and hardness of SAF2507 super duplex stainless steel showed the first sharp decline followed by slowly rising law, while the elongation and impact work showed a sharp increase after the slow decline of the law; when the thermoforming temperature of 1 050 ℃, The turning point of the change of mechanical properties appeared. At this time, the tensile strength of the material was 860 MPa, the microhardness was 26.9 HRC, the elongation was 37.6% and the impact energy was 148 J.