Effect of Sinter Hardening on Microstructure and Mechanical Properties of Astaloy 85Mo  

作　　者：K Sheikhi Moghaddam M Ghambari H Farhangi N Solimanjad 

机构地区：[1]School of Metallurgy and Materials Engineering,College of Engineering University of Tehran,Tehran11155-4563,Iran [2]Hgans AB,Hgans SE-263 83,Sweden

出　　处：《Journal of Iron and Steel Research International》2012年第10期43-46,共4页

摘　　要：Effect of sinter hardening on the microstructure, density, hardness and tensile properties of Astaloy 85Mo+0.7% graphite was investigated. For this purpose, Astaloy 85Mo, a pre-alloyed powder, was mixed with 0.7% UF4 graphite and then pressed in single action die and sintered at 1 120 ℃ for 30 min in N2-10%H2 atmosphere. Then samples were cooled from 0.5 to 3 ℃/s sintering temperature in accordance with different cooling rates. The difference in microstructure, hardness, density and tensile properties of the samples associated with different cooling rates from sintering temperature has been investigated. The results show that the microstructure remains bainitic by changing cooling rate, but it becomes finer and then the hardness and tensile strength of the samples will increase by increasing the cooling rate from sintering temperature.Effect of sinter hardening on the microstructure, density, hardness and tensile properties of Astaloy 85Mo+0.7% graphite was investigated. For this purpose, Astaloy 85Mo, a pre-alloyed powder, was mixed with 0.7% UF4 graphite and then pressed in single action die and sintered at 1 120 ℃ for 30 min in N2-10%H2 atmosphere. Then samples were cooled from 0.5 to 3 ℃/s sintering temperature in accordance with different cooling rates. The difference in microstructure, hardness, density and tensile properties of the samples associated with different cooling rates from sintering temperature has been investigated. The results show that the microstructure remains bainitic by changing cooling rate, but it becomes finer and then the hardness and tensile strength of the samples will increase by increasing the cooling rate from sintering temperature.

关 键 词：sinter hardening Astaloy 85Mo cooling rate bainitic microstructure 

分 类 号：TF046.4[冶金工程—冶金物理化学]