低合金型高强度不锈钢材料的实验室研究

Laboratory research on a high strength stainless steel with low alloy content

为提高不锈钢的机械性能,促进其作为结构材料使用,通过控制适当的合金元素配比和相应的加工工艺,实验室开发了一种低合金型的高强度不锈钢材料。介绍了不同工艺下其组织、硬度和力学性能的变化规律,并确定了能得到较好强塑性结合的热处理制度;利用金相显微镜、EBSD、TEM对其微观组织结构进行研究,分析了其强度提高的原因;根据相关国家标准评价了其耐腐蚀性和焊接性。结果表明,在铁素体基体上引入适当的第二相,可以在保持良好塑性的基础上大幅度提高材料的强度,同时具有良好的耐腐蚀性和焊接性。

In order to improve the mechanical properties of stainless steel and promote its application as a structural material, we developed a high strength stainless steel with low alloy content in the laboratory by controlling the alloy element content and using appropriate processing technologies. This paper introduced the variation law of the structure, hardness and mechanical properties of the stainless steel processed with different technologies. In addition, the suitable heat treatment regime was determined with which a good combination of strength and plasticity can be obtained. With the help of a metallographic microscope, EBSD and TEM, research was made on the microstructure of the stainless steel and reasons for high strength were analyzed. The corrosion resistant property and welding performance were also evaluated according to related GB standards. The results indicate that through the introduction of a proper second phase to the ferrite base, the strength can be increased largely while good plasticity, corrosion resistance and weldability can be kept.