Cailiao Baohu (Jan 2024)
Study on High-Temperature Friction and Wear Characteristics of Aluminum-Containing Martenitic Stainless Steel Sample of Laser Additive
Abstract
Laser additive martensite stainless steel can be applied to high temperature parts below 600 ℃.In order to further improve its high temperature wear resistance，four kinds of martensite stainless steel samples with different aluminum content (0，1%，2%and 3%，mass fraction) were prepared.The four types of martensitic stainless steel samples were heat treated at temperatures of 25，200，400，and 600 ℃using a box type resistance furnace.Moreover，the metallographic structure and high-temperature friction and wear properties of the samples were studied by OM，XRD，SEM，3D depth-of-field microscope，high-temperature friction and wear testing machine and JMatPro software.Results showed that with the increase of the aluminum content，the average hardness of the specimen decreased from 57.87 HRC to 42.46 HRC.With the extension of the insulation time at 600 ℃，the hardness of the samples decreased rapidly and stabilized，and its value decreased from 44.79 HRC to 28.70 HRC.In addition，the increase in aluminum content had no obvious effect on the friction coefficient of the sample at 25 ℃，and its values were in the range of 0.8～0.9.When the aluminum content reached 3%，the friction coefficient of the sample in 600 ℃environment was reduced to about 0.45，which was about 52.94%of that at 25 ℃.The volume wear amount declined to 0.021 4 mm3，which was approximately 9%of that at 25 ℃.Meanwhile，the main phase of the sample was composed of martensite and a small amount of precipitated phases such as carbide.In general，the addition of 3%aluminum could significantly improve the high-temperature friction wear performance of martensite stainless steel prepared by laser additive.
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