Yang Teng,Shi Zhiyue,Wang Rui,et al.Effect of High Temperature Tempering on Microstructure and Mechanical Properties of High Nitrogen Martensitic Stainless Bearing Steel[J].Special Steel,2026,47(02):108-114.
Yang Teng,Shi Zhiyue,Wang Rui,et al.Effect of High Temperature Tempering on Microstructure and Mechanical Properties of High Nitrogen Martensitic Stainless Bearing Steel[J].Special Steel,2026,47(02):108-114. DOI: 10.20057/j.1003-8620.N250532.
Effect of High Temperature Tempering on Microstructure and Mechanical Properties of High Nitrogen Martensitic Stainless Bearing Steel
The high nitrogen martensitic stainless bearing steel was tempered at 400 ℃ - 600 ℃, and its mechanical properties such as hardness, strength and toughness were tested. The microstructure was characterized by optical microscope, SEM and TEM. The effects of high temperature tempering on its mechanical properties and microstructure were systematically studied. The test results show that, with the increase of tempering temperature, the hardness and strength of the material increase first and then decrease, and the impact performance continues to increase. When tempered at 500 ℃, the hardness and tensile strength reach the maximum values, which are 60.8 HRC and 2 360 MPa, respectively. The microstructure analysis shows that, when the tempering temperature is no higher than 500 ℃, the sample is mainly tempered martensite structure with a small amount of secondary-phase particles. After more than 500 ℃, the martensite structure gradually transforms into tempered sorbite, and the number and size of the secondary-phase particles increase. The size and number of secondary-phase particles tempered at 500 ℃ and 600 ℃ were counted in the same area. It is found that the total number and area ratio of secondary-phase particles tempered at 600 ℃ are much higher than those tempered at 5
00 ℃, and the proportion of large-sized particles increase significantly. The secondary-phase M
23
C
6
and Cr
2
N precipitates in the samples tempered at 500 ℃ and 600 ℃. These secondary-phase particles grow densely at 600 ℃, resulting in a decrease of secondary-phase strengthening effect, which is attributed to the considerable decreases in strength and hardness.
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