Ni、Fe含量对90Mo-Ni-Fe合金性能的影响  

Effects of Ni and Fe contents on properties of 90Mo-Ni-Fe alloy

作　　者：刘俊汝 张国华 周国治 LIU Jun-ru;ZHANG Guo-hua;CHOU Kuo-chih(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083

出　　处：《中国有色金属学报》2023年第3期792-803,共12页The Chinese Journal of Nonferrous Metals

摘　　要：为改善95Mo-Ni-Fe合金烧结致密化过程中晶间脆性的现象,本文研究合金中Ni、Fe含量对90Mo-Ni-Fe合金的影响,同时在此基础上通过添加少量MoB进行性能强化。以Mo、Ni、Fe的金属氧化物为原料,制备了微米级的90Mo-Ni-Fe复合粉体,并采用粉末冶金法烧结,对比了不同Ni、Fe含量90Mo-Ni-Fe合金的致密化程度、显微组织及力学性能的差异。结果表明:Fe含量的增加可以抑制90Mo-Ni-Fe合金中Mo晶粒的长大,同时减少晶间脆性金属间化合物的形成;90Mo-5Ni-5Fe合金的硬度和弯曲强度最高可达到655HV和613 MPa。结合合金断口形貌分析,脆性金属间化合物的存在恶化了界面性能,导致材料的弯曲强度降低。另外,添加2%MoB后,90Mo-5Ni-5Fe合金的相对密度和硬度分别提高为98.00%和861HV。In order to further improve the intergranular brittleness of 95Mo-Ni-Fe alloy during sintering and densification,the effect of the Ni and Fe contents on the 90Mo-Ni-Fe alloy was studied.On this basis,the mechanical properties were strengthened by small amount addition of MoB.The metal oxides of Mo,Ni and Fe were used as raw materials to prepare micron 90Mo-Ni-Fe composite powders.The densification degree,mechanical properties and microstructure of 90Mo-Ni-Fe alloys with different Ni and Fe contents were investigated after preparing alloys by powder metallurgy.The results show that,with the increase of Fe content,the growth of Mo grains is inhibited.Meanwhile,the formation of brittle intermetallic compound between grains is also reduced.The experimental results show that the hardness and the bending strength of 90Mo-5Ni-5Fe alloy are as high as 655HV and 613 MPa.Combined with fracture morphology analysis,the improvement of the bending strength is attributed to the reduction of brittle intermetallic compounds.In addition,the relative density and hardness of 90Mo-5Ni-5Fe alloy after adding 2%MoB are increased to 98.00%and 861HV,respectively.

关 键 词：90Mo-Ni-Fe合金 MoB 结构演变 力学性能 

分 类 号：TF841.2[冶金工程—有色金属冶金]