轧后超快冷及亚温淬火对5%Ni钢微观组织与低温韧性的影响机理
发布时间：2019-05-18 09:52
【摘要】：采用"控制轧制、轧后超快冷、亚温淬火+回火(UFC-LT)"工艺制备了5%Ni钢,系统研究了这一工艺条件下5%Ni钢的微观组织与力学性能,并与常规调质工艺(QT)和离线淬火、亚温淬火加回火工艺(QLT)进行了对比。结果表明,经UFC-LT工艺处理后,5%Ni钢的显微组织由回火马氏体、临界铁素体和5.83%的逆转奥氏体组成,并可以获得优于QT和QLT工艺的强韧性匹配(抗拉强度为608 MPa,屈服强度为491 MPa,-196℃时Charpy冲击功为185 J),韧脆转变温度由QT工艺的-152℃下降到-196℃以下。与QT工艺相比,UFC-LT工艺改善韧性的因素主要有渗碳体的溶解、高密度的大角度晶界及5.83%的逆转奥氏体。
[Abstract]:5%Ni steel was prepared by "controlled rolling, ultra-fast cooling after rolling, sub-temperature quenching and tempering (UFC-LT)". The microstructure and mechanical properties of 5%Ni steel under this process were studied systematically. The results were compared with those of conventional quenching and tempering process (QT), off-line quenching, subtemperature quenching and tempering process (QLT). The results show that the microstructure of 5% Ni steel treated by UFC-LT process is composed of tempered martensite, critical ferrite and 5.83% reverse Austenite, and the strength and toughness matching is better than that of QT and QLT process (tensile strength is 608 MPa,). When the yield strength is 491 MPa,-196 鈩，
本文编号：2479895
[Abstract]:5%Ni steel was prepared by "controlled rolling, ultra-fast cooling after rolling, sub-temperature quenching and tempering (UFC-LT)". The microstructure and mechanical properties of 5%Ni steel under this process were studied systematically. The results were compared with those of conventional quenching and tempering process (QT), off-line quenching, subtemperature quenching and tempering process (QLT). The results show that the microstructure of 5% Ni steel treated by UFC-LT process is composed of tempered martensite, critical ferrite and 5.83% reverse Austenite, and the strength and toughness matching is better than that of QT and QLT process (tensile strength is 608 MPa,). When the yield strength is 491 MPa,-196 鈩，
本文编号：2479895
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