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采用SEM、EDS、拉伸及冲击试验,研究了氮对高电阻率高导磁不锈钢组织和性能的影响。结果表明,氮能显著扩大奥氏体相区,在1000℃保温1h油淬并在620℃回火后,含氮0.09%的试样与不含氮的试样相比在铁素体基体上出现少量马氏体,0.18%氮使原单相铁素体变为铁素体+马氏体双相组织,并且硬脆的σ相消失;添加0.09%和0.18%氮元素材料的强度和硬度均较未添加前有明显提高,材料的力学性能特别是冲击韧性得到显著改善。
The effects of nitrogen on microstructure and properties of high permeability stainless steel with high resistivity were studied by SEM, EDS, tensile and impact tests. The results show that the nitrogen can significantly expand the austenite phase zone, and after the oil quenching at 1000 ℃ for 1 h and tempering at 620 ℃, the sample containing 0.09% nitrogen is better than the non-nitrogen containing sample on the ferrite matrix A small amount of martensite appeared and 0.18% nitrogen changed the original single-phase ferrite to ferrite + martensite dual-phase structure, and the hard and brittle σ phase disappeared. Both the strength and the hardness of 0.09% and 0.18% Compared with no increase before adding, the mechanical properties of the material, especially the impact toughness has been significantly improved.