制备工艺对高氮轴承钢强韧性的影响

发布时间：2019-08-12 10:27

【摘要】：采用的高氮马氏体不锈轴承钢经非真空感应熔炼+电渣重熔双联工艺冶炼后,分别采用锻造成型、均匀化锻造和电渣重熔连续定向凝固+均匀化锻造3种工艺进行处理。对3种工艺下的碳化物和强韧性能进行了研究。结果表明,经锻造成型处理后,试验钢的抗拉强度达到2 056 MPa,屈服强度(Rp0.2)达到1 734 MPa,但冲击功仅有2J;经均匀化锻造后强度有所降低,但冲击功较前者提高了100%;经电渣重熔连续定向凝固+均匀化锻造后钢的强度较锻造成型时没有明显的变化,硬度由57.8 HRC升高至58.5 HRC,冲击功提高了200%。经过对夹杂物、原奥氏体晶粒和碳化物等组织进行分析后发现,这主要是由电渣重熔连续定向凝固提高了钢的纯净度和均匀化锻造使碳化物的分布更加弥散所致。
[Abstract]:After smelting the high nitrogen maraging stainless bearing steel by non-vacuum induction melting electroslag remelting double process, three processes, forging molding, homogenization forging and electroslag remelting continuous directional solidification homogenization forging, were used to treat the steel by forging, homogenization forging and electroslag remelting continuous directional solidification homogenization forging, respectively. The carbides and toughness of the three processes were studied. The results show that the tensile strength of the test steel reaches 2056 MPa, yield strength (Rp0.2) of 1 734 MPa, but the impact work is only 2 J after forging, and the strength decreases after homogenization forging, but the impact work is 100% higher than that of the former. The strength of the steel after continuous directional solidification homogenization forging by electroslag remelting has no obvious change compared with that during forging, and the hardness increases from 57.8 HRC to 58.5 HRC,. The impact work increases by 200%. After analyzing the microstructure of inclusions, original Austenite grains and carbides, it is found that this is mainly due to the continuous directional solidification of electroslag to improve the purity of steel and homogenize forging to make the distribution of carbides more dispersed.
【作者单位】：昆明理工大学材料科学与工程学院;钢铁研究总院特殊钢研究所;
【分类号】：TG316;TG142;TF764.1

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