回火温度对高氮轴承钢碳化物演变及硬度的影响

doi:10.13228/j.boyuan.issn0449-749x.20140609

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Abstract High nitrogen martensitic stainless bearing steel was direct-quenched， repeat twice cryogenic?treatment and tempered at different temperatures，?A?correlation between?evolvement?rule and variation in hardness of different tempering temperatures was investigated by means of optical microscopy， SEM， TEM and hardness measurement. According to the trend of rockwell hardness rises after the first fall and then rises， finally decline. The frequency distribution of carbide， number， mean size and carbides occupied area ratio of different tempering temperatures were characterized?and?analyzed. Research found that with the tempering temperature increased from 150 to 500 ℃， The size of the carbide increased gradually from 0.39 grew up to 0.62 μm， carbide approximate to spherical and the diffraction patterns calibrated still for M23C6. Tempered at 150-300 ℃，the drop of ?hardness is related to matrix desolventizing； With tiny carbides are precipitated tempered 300 to 450 ℃， the number per unit area and area ratio of carbides increased； Tempered at 500 ℃， the agglomeration of fine carbide result in number per unit area and area ratio of carbides decreased. This?led?us?to?make?a?summing up?of variation in hardness is related to the number and the area ratio of the carbides.

Key words： tempering temperature, martensitic stainless steel, carbide,hardness

Received: 13 October 2014 Published: 11 June 2015

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	GU Yu-Ze

Cite this article:

GU Yu-Ze. Effect of tempering temperature on the evolution of carbide and hardness of high-nitrogen bearing?steel[J]. Iron and Steel, 2015, 50(6): 81-86.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20140609 OR http://www.chinamet.cn/Jweb_gt/EN/Y2015/V50/I6/81

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