Cerium-alloyed ultra-high strength maraging steel with good ductility: Experiments, first-principles calculations and phase-field simulations
Cerium-alloyed ultra-high strength maraging steel with good ductility: Experiments, first-principles calculations and phase-field simulations
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DOI：
10.1016/j.msea.2022.143306
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发表时间：
2022-05-19
期刊：
影响因子：
6.4
通讯作者：
Ren, Huiping
中科院分区：
文献类型：
--
作者：
Gao, Xueyun;Wang, Haiyan;Ren, Huiping
在获得超高强度的同时提高塑性一直是高性能马氏体时效钢发展的一个挑战。为此，采用基于第一性原理的相场模拟和晶体塑性模拟相结合的方法，研究了Ce对B2-NiAl沉淀强化马氏体时效钢力学性能的影响。拉伸试验表明，含铈马氏体时效钢具有抗拉强度为-2000 MPa，拉伸塑性为-10%的优异组合。利用EBSD、HRTEM和APT等手段对不同尺度下的显微组织进行了表征。结果表明，Ce的存在降低了B2-NiAl相的析出驱动力，对B2-NiAl相的析出行为有显著影响。EBSD表征表明，含Ce钢具有较高的HAGB分数，这有助于改善实验钢的塑性。结果表明，Ce降低了钢的Ms温度，使V1/V2和V1/V5变晶间晶界的长度分数增加，从而导致高比例HAGB的形成。
Improving ductility while achieving ultra-high strength has always been a challenge in developing of high performance maraging steels. To this end, the study of the influence of Ce on the mechanical performance of B2-NiAl precipitation strengthened maraging steel was performed via experimental characterization combined with first-principles calculations-based phase-field simulations and crystal plasticity simulations. The tensile test revealed that the Ce-bearing maraging steel possesses a remarkable combination of ultimate tensile strength of-2000 MPa and tensile ductility of-10%. The microstructures at various scales were characterized by EBSD, HRTEM and APT. It was found that Ce exhibits a notable effect on the precipitation behavior of B2-NiAl particles because the presence of Ce decreases the precipitation driving force of B2-NiAl phase. EBSD characterization revealed that Ce-bearing steel possesses a higher fraction of HAGBs which facilitates the improvement the ductility of the experimental steel. Reconstruction of parent austenite grains and analysis of martensite variants selection were performed, and the results indicated that the lowering of the Ms temperature of the steel caused by Ce leads to more length fractions of V1/V2 and V1/V5 inter-variant boundaries, which contribute to the formation of higher fraction of HAGBs.