摘要
研究了以Fe-2Ni为基体,向其中分别加入0.5%、1%和3%的Cr时,合金烧结态和热处理态的力学性能和微观组织变化。结果表明,随着Cr含量的增加,合金密度降低,孔隙增多且变大;烧结态强度和硬度增加,伸长率和冲击吸收功下降。Fe-2Ni-3Cr合金的强度和硬度最高分别为975 MPa和73.3 HRB;Fe-2Ni合金的伸长率和冲击吸收功最高分别为12%和7.6 J;热处理态合金强度相差不大,Fe-2Ni-0.5Cr的强度最高达到1 240 MPa;伸长率和冲击功下降;硬度增加。烧结态合金的微观组织为珠光体+很少量的铁素体,Fe-2Ni-3Cr合金中出现Ni的富集区;热处理态合金的微观组织加入Cr后变为回火马氏体,且在Fe-2Ni-3Cr合金中出现网状的二次渗碳体。
The present study is concemed with the properties and microstructure of sintered and heat treated Fe-2Ni alloys with Cr addive of 0.5%, 1% and 3%. The results show that with Cr increasing, the density of alloy reduces, number and size of pore increase; the strength and the hardness of sintered Fe-Ni-Cr alloy increase, the elongation and the impact energy of sintered Fe-Ni-Cr alloy reduce. The strength and the hardness of Fe-2Ni-3Cr alloy are 975MPa and 73.3HRB respectively; the elongation and the impact energy of Fe-2Ni are 12% and 7.6J; The strength of alloy change slightly after heat treatment, the max is 1240MPa for Fe-2Ni-0.5Cr alloy; the elongation and the impact energy of sintered Fe-Ni-Cr alloy reduce and the hardness increase after heat treatment. The microstructure of sintered alloy consists of pearlite and little ferrite, the enrichment area of Ni occurs in the microstructure of Fe-2Ni-3Cr alloy; the microstructure of heat treated alloy with Cr additve consists of temper martensite and meshy secondary cementite.
出处
《粉末冶金技术》
EI
CAS
CSCD
北大核心
2005年第4期268-272,共5页
Powder Metallurgy Technology
基金
国家"八六三"计划资助项目(2001AA337050)
霍英东基金资助项目(81041)
全国优秀博士论文资助项目(200135)
作者简介
姜峰（1979-），男，硕士研究生从事MIM合金钢的研究。E—mail：jumpfeng@163．com
李益民，博士，教授。E—mail：liyimin33@yahoo．com．cn
