粉末冶金高氮超级奥氏体不锈钢的开发

Development of high nitrogen super austenitic stainless steels by powder metallurgy process

采用气雾化法制备高氮超级奥氏体不锈钢粉末,利用热等静压成形。结果表明,热等静压后,材料完全致密,而σ及Cr2 N两相的析出导致材料塑性、韧性及耐蚀性显著下降。材料经1200℃×1 h固溶处理后,力学性能及耐蚀性能大大提高,抗拉强度Rm为1050 MPa、屈服强度Rp0.2为735 MPa,伸长率A为57.0%,自腐蚀电位Ecorr为0.946 V。

The high nitrogen super austenitic stainless steel powders were prepared by gas atomization and formed by hot isostatic pressing （HIP）. The results show that the steel is fully dense after HIP. As the precipitation of o and Cr2N phases, plasticity, toughness and corrosion resistance of the steel decreases significantly. The properties and corrosion resistance of the steel are greatly improved after solution treatment at 1200 ℃ for 1 h, for which tensile strength, yield strength, elongation and self-corrosion potential arc 1050 MPa ,735 MPa ,57% and O. 946 V, respectively.