氮对冷变形亚稳奥氏体不锈钢1~2Cr13Mn9Ni4组织和性能的影响

Effect of Nitrogen on Structure and Properties of Cold-Deformed Metastable Austenite Stainless Steel 1~2Cr13Mn9Ni4

在25 kg真空感应炉充氩气或大气下加氮化铬铁熔炼成不同氮含量的试验用1~2Cr13Mn9Ni4钢(/%:0.08~0.18C,0.17~0.34Si,8.11~9.27Mn,0.008~0.028P,0.007~0.032S,12.57~13.34Cr,4.05~4.65Ni,0~0.34N)。该钢经锻造、热轧成0.8 mm钢带,再进行0~45%的冷轧变形。试验研究了冷轧变形量和氮含量对该钢组织,力学性能和耐蚀性的影响。结果表明,通过降碳和加适量氮可改善Cr13Mn9Ni4钢的强度和塑性;冷变形钢在敏化状态下均有不同程度的晶间腐蚀倾向;氮有利于提高亚稳奥氏体不锈钢相组成的稳定性;氮使不含稳定化元素的亚稳奥氏体不锈钢在SO_4^(2-)介质中易于钝化,提高了在非敏化状态下的耐腐蚀性,同时明显提高了在Cl-介质中耐点蚀性能。

The tested steel 1 - 2Cr13Mn9Ni4 with different nitrogen content （/% ： 0. 08 - 0. 18C, 0. 17 - 0. 34Si, 8.11 -9. 27Mn, 0. 008 -0. 028P, 0. 007 -0. 032S, 12. 57 - 13.34Cr, 4. 05 -4. 65Ni, 0 -0. 34N） is melted by a 25 kg vacuum induction furnace adding chromium nitride in atmosphere or argon atmosphere. The test steel is forged and rolled to 0. 8 mm strip then cold-rolled with 0 - 45% deformation. The effect of cold-rolled deformation and nitrogen content on structure, mechanical properties and corrosion resistance of steel has been tested and studied. Results show that the strength and plasticity of steel Cr13Mn9Ni4 are improved by decreasing carbon content and adding suitable nitrogen in steel; the cold-rolled deformed steel in sensitizing condition has some tendency to grain-boundary corrosion in varying de- grees ; the nitrogen is available to increase the stability of phase composition in metastable austenite stainless steel; and the nitrogen contributes to passivating of metastable austenite stainless steel non-bearing stabilizing elements in SO42- medium and increases the corrosion resistance of steel in non-sensitized condition, and it obviously increases the pitting corrosion resistance in Cl^- medium.