研究了热轧态1Cr16Co5Ni2MoWVNbN马氏体耐热钢经一道次等径角挤压(ECAP)变形+680℃2 h空冷处理后的微观结构和力学性能. 结果表明: 经ECAP变形后, 马氏体板条大部分已碎化成亚晶粒和位错胞, 第二相纳米粒子(M23C6)分布更弥散均匀; 经随后的退火处理, 发生了回复和部分再结晶, 位错密度有所降低, 形成大量尺寸仅几百纳米的等轴亚晶粒. ECAP变形后材料的屈服强度有很大提高(提高至1400 MPa), 但延伸率和静力韧度均大幅度下降(分别降至7.3%和100 MJ/m3); 随后的退火处理可恢复其塑性(15.4%), 其强度(1044 MPa)和静力韧度(181.6 MJ/m3)均较初始态(922 MPa, 160.7 MJ/m3)高.
The microstructures and mechanical properties ofЭП866 martensite heat-resistant steel submitted to equal channel angular pressing (ECAP) for one pass and subsequent heat treatment were investigated. It was hound that most of the lath martensite has been broken, and the nano-precipitant distributed more uniformly after ECAP deformation. By annealing at 680℃ for 2h, the dislocation density decreased and a great deal of equiaxed subgrains with sizes of several hundred of nanometers were produced, which could be attributed to the dislocation recovery and recrystallization. The yield strength of the ECAPed sample increased significantly, but its ductility decreased a lot. After subsequent annealing treatment, the ductility of the ECAP steel can be improved to the level of initial state. Both the strength and static toughness of the steel after ECAP deformation and subsequent heat treatment can be increased simultaneously compared with those of initial state.
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