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利用光学显微镜、扫描电子显微镜(SEM)、X射线衍射(XRD)、纳米力学探针、常温拉伸等方法,研究了S32750超级双相不锈钢中σ相的析出规律及其对组织性能的影响。结果表明,σ相优先析出于奥氏体晶粒边界处、铁素体含量稀少之处,其析出量随固溶温度的升高而呈现出先增大后减小的趋势,在900℃时,析出量达到最大。材料的硬度与变形抗力会随着σ相析出量的增多而增大;σ相析出时引起的体积膨胀会引起奥氏体边部的硬度与杨氏模量增大;σ相析出也容易造成材料中微裂纹的形成。S32750双相不锈钢应在1020℃到1080℃温度范围内进行固溶,以获得较好的冷加工性能。
The precipitation regularity of σ phase in S32750 super duplex stainless steel and its effect on the microstructure and properties were studied by means of optical microscope, scanning electron microscope (SEM), X-ray diffraction (XRD), nanomechanical probe and room temperature tensile test. The results show that the σ phase preferentially precipitates at the grain boundaries of austenite and the ferrite content is scarce. The precipitation amount increases first and then decreases with the increase of solution temperature. At 900 ℃, The amount of precipitation reached the maximum. The hardness and deformation resistance of the material will increase with the increase of the precipitation amount of σ phase; the volume expansion caused by the precipitation of σ phase will cause the hardness and Young’s modulus of the austenite edge to increase; and the precipitation of σ phase will easily cause Formation of micro-cracks in the material. S32750 duplex stainless steel should be in the 1020 ℃ to 1080 ℃ temperature range of solution, in order to obtain better cold workability.