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研究了不同固溶处理温度对特超级双相不锈钢00Cr27Ni7Mo5N组织及力学性能的影响。采用光镜、扫描电镜、能谱仪、显微硬度、冲击和拉伸测试等手段研究σ相的析出规律及其对力学性能的影响。运用Thermo-Calc热力学软件计算00Cr27Ni7Mo5N相含量随温度的变化,并与测试结果进行对比分析。研究结果表明,当固溶温度在800～1 050℃之间,00Cr27Ni7Mo5N有大量金属间化合物σ相析出,导致钢的强度和硬度增加,塑韧性显著下降。当固溶温度在1 070～1 200℃时,钢中σ相溶解,钢的塑韧性提高,硬度下降。1 100℃固溶处理时,00Cr27Ni7Mo5N具有最佳的综合力学性能。
The effect of different solution treatment temperatures on the microstructure and mechanical properties of super-duplex stainless steel 00Cr27Ni7Mo5N was studied. The precipitation law of σ phase and its influence on the mechanical properties were studied by light microscope, scanning electron microscope, energy dispersive spectrometer, microhardness, impact and tensile test. The temperature of 00Cr27Ni7Mo5N phase was calculated by Thermo-Calc thermodynamic software, and compared with the test results. The results show that when the solid solution temperature is between 800 and 1050 ℃, a large amount of intermetallic phase σ precipitates in 00Cr27Ni7Mo5N, which leads to the increase of strength and hardness of steel, and the decrease of plasticity and toughness. When the solution temperature is in the range of 1 070-1 200 ℃, the σ phase in the steel dissolves, the plasticity and toughness of the steel increases, and the hardness decreases. 1 100 ℃ solution treatment, 00Cr27Ni7Mo5N has the best overall mechanical properties.