A novel Cu-Ni added medium Mn steel: Precipitation of Cu-rich particles and austenite reversed transformation occurring simultaneously during ART annealing
A novel Cu-Ni added medium Mn steel: Precipitation of Cu-rich particles and austenite reversed transformation occurring simultaneously during ART annealing
复制标题
添加Cu-Ni的新型中锰钢：ART退火过程中富铜颗粒的析出与奥氏体逆相变同时发生
DOI：
10.1016/j.msea.2019.01.014
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发表时间：
2019-02-11
期刊：
影响因子：
6.4
通讯作者：
Liu, Xianghua
中科院分区：
文献类型：
--
作者：
Yan, Shu;Liang, Taosha;Liu, Xianghua
在冶炼过程中，特意将 Cu 和 Ni 两种元素添加到典型的中锰钢中，通过在奥氏体逆相变 (ART) 的同时析出 Cu 颗粒，进一步提高机械性能。研究了Cu、Ni添加后的显微组织和力学性能特征。结果证明了ART退火过程中富铜颗粒在再结晶铁素体晶粒或回火马氏体板条内析出的可行性，且富铜颗粒尺寸为纳米级，其直径小于20 nm。中锰钢中添加Cu和Ni不仅有利于反转奥氏体分数的增加，而且在ART退火时形成大量退火孪晶，有助于分裂和进一步细化奥氏体晶粒。另外，Cu和Ni的添加使得抗拉强度显着增加，约90-150MPa，但没有提高屈服强度，而且导致抗拉延展性劣化。但即便如此，拉伸强度和总伸长率 (PSE) 的最佳乘积仍高于 42 GPa%。此外，还证实，在高污染率下，中锰钢仍然具有优异的综合性能。
Two elements, Cu and Ni, were deliberately added into a typical medium Mn steel during smelting for further improving mechanical properties through the precipitation of Cu particles simultaneously with austenite reversed transformation (ART). The characteristics of microstructure and mechanical properties due to the addition of Cu and Ni was investigated. From the results, the feasibility that Cu-rich particles precipitate within recrystallized ferritic grains or tempered martensitic laths during ART annealing is proved, and the size of Cu-rich particles are nano-scaled, of which the diameter is less than 20 nm. The addition of Cu and Ni in medium Mn steel not only benefits the increase of reversed austenite fraction, but also the formation of a considerable amount of annealing twins during ART annealing, which contributes to split and further refine the austenite grains. Additionally, the addition of Cu and Ni enables a significant increase of tensile strength, about 90-150 MPa while do not improve the yield strength, and moreover results in the deterioration of tensile ductility. Yet even so, the optimal product of tensile strength and total elongation (PSE) is above 42 GPa%. Furthermore, it is confirmed that at high stain rates medium Mn steels still have an outstanding comprehensive properties.