高温回火对USS122G超高强度不锈钢显微组织的影响

doi:10.13228/j.boyuan.issn0449-749x.20200140

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Abstract In order to study the influence of various tempering process on the microstructure and hardness of USS122G ultra-high strength stainless steel. Using SEM,TEM,physicochemical phase analysis,testing and characterization. The results indicated that volume percent of the austenite and the number of second phase reduced with the increased of tempering temperature. When the temperature was 680-700 ℃,the average size of the second phase was about 65 nm. At this time,the strengthening effect of the second phase was smaller and the hardness of the sample was 36HRC-37HRC. At 700 ℃,the second phase aggregated at the grain boundary. When the temperature was higher than 720 ℃,the number of smaller second phase increased. The second phase was distributed in a network along the grain boundary and increased the hardness. The increased in hardness of steel was mainly affected by the strengthening of the second phase. Finally,the optimum tempering temperature of USS122G steel was 660-680 ℃,considering the influences of austenite volume percent,second phase and hardness.

Key words： ultra-high strength stainless steel high temperature tempering volume percent of austenite second phase hardness

Received: 24 March 2020

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	BAI Ruo-xin
	LIU Zhen-bao
	CAO Jian-chun
	WANG Xiao-hui

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BAI Ruo-xin,LIU Zhen-bao,CAO Jian-chun等. Effect of high temperature tempering on microstructure of USS122G ultra-high strength stainless steel[J]. Iron and Steel, 2020, 55(12): 81-86.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20200140 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I12/81

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