CrCoNiMn多元固溶强化铁基合金的组织与力学性能

Microstructure and Mechanical Properties of CrCoNiMn Multivariate Solid Solution Reinforced Fe-based Alloys

研究了Fe100-x(CoCrNiMn)x合金的微观组织,相结构,断口形貌和力学性能。结果表明,随合金中固溶元素CoCrNiMn含量的降低,金相组织为枝晶和枝晶间,但树枝晶上分布的板条状结构增多。合金的相结构均为BCC相结构。此外,合金的力学性能出现先下降后升高的变化规律,具有良好伸长率的试样断口为典型的韧窝状,且韧窝数量多,尺寸小,衬度深。

The microstructure, phase structure, fracture morphology and mechanical properties of Fe100-x (CoCrNiMn)x alloys were investigated. The results show that with the decrease of CoCrNiMn content, microstructure are dendrites and interdendritic, but the distribution of lath structures on dendrites is increased. The metallographic structure changes from dendritic to dendritic matrix with lath structure;the phase structure of the alloys is still body-centered cubic (BCC) phase structure. In addition, the yield strength and ultimate tensile strength of the alloys are decreased firstly and then increased. A large number of small and deep dimples are observed in the fracture of the samples with good elongation.