硬质颗粒增强型新能源汽车铁基粉末冶金阀座的热处理工艺

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Abstract The valve seat frame body was pressed using W6Mo5Cr4V2 as based powder and adding Fe-Mo, Co-Cr-Mo and other hard particles. The particle reinforced iron-based powder metallurgy valve seat was prepared by vacuum high temperature infiltration method using special copper powder (Cu-Fe-Mn) as infiltration agent, with quenching and tempering heat treatment. The effects of quenching temperature and tempering temperature on the micro hardness of valve seat matrix and particles and the friction and wear properties of the valve seat materials were studied. The orthogonal treatment was used to optimize the heat treatment process. The results show that the quenching temperature has a great influence on the hardness and wear resistance of the valve seat material matrix W6Mo5Cr4V2, Fe-Mo and Co-Cr-Mo hard particles. When quenching at 1 140-1 260 ℃, Fe-Mo and Co-Cr-Mo hard particles diffuse obviously. The effect of quenching on carbides in copper-covered areas is small. There are more undissolved and larger size carbides in the covering area. When the quenching temperature is 1 220 ℃, the microhardness (HV) of the matrix material, Fe-Mo and Co-Cr-Mo hard particles are 528, 892 and 632 respectively. Tempering temperature has little effect on hardness of the valve seat. The highest hardness can be obtained when the tempering temperature is 520 ℃. The seat with hardness (HRC) of 49.2 and wear quantity of 0.029 5 g are obtained at quenching temperature of 1 220 ℃, tempering temperature of 520 ℃ and tempering number of 3.

Key words： new energy particle reinforced iron-based alloy heat treatment hardness wear quantity

Received: 05 June 2017 Published: 11 July 2019

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	XIAO Zisheng
	LUO Cheng
	HUA Jianjie
	ZHANG Minghui
	ZHANG Zhi

Cite this article:

XIAO Zisheng,LUO Cheng,HUA Jianjie, et al. Heat treatment process of rigid particle reinforced iron-based powder metallurgy valve seat for new energy vehicle[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(1): 9-16.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I1/9

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