Effect of nitride carbonize and oxidize multi-treatment (QPQ) on microstructure and properties of MPS700A steel

doi:10.13251/j.issn.0254-6051.2021.04.014

Abstract

Abstract: Corrosion resistant and heat resistant stainless steel MPS700A steel was surface modified by nitride carbonize and oxidize multi-treatment(QPQ) technology, and then the salt bath nitrocarburizing tests were conducted at 450-500 ℃ for 5 h and 550-570 ℃ for 3 h respectively, both with the oxidation treatment process at 400 ℃ for 30 min. Then the surface morphologies, surface hardness, brittleness and wear resistance of the QPQ treated specimens were analyzed. The results show that the QPQ treated layer is mainly composed of oxide film, loose layer, compound layer and diffusion layer, and the hardness of the QPQ specimens is obviously improved. The hardness values of the specimens nitrocarburized respectively at 490 ℃ and 550 ℃ are the highest in the low and the high temperature ranges, respectively being 1295 HV0.1 and 1344 HV0.1, i.e., 3.75 and 3.90 times of that of the matrix steel. The QPQ treated layers have fine, uniform and compact microstructures, and have low brittleness, good wear resistance, and better high temperature friction and wear performance than that of the bare steel, especially above 500 ℃. Compared with that at 550 ℃, the QPQ specimen nitrocarburized at 490 ℃ in salt bath has lower brittleness and better high temperature friction and wear performance.

Key words: nitride carbonize and oxidize multi-treatment (QPQ), surface morphology, surface hardness, brittleness, wear resistance

CLC Number:

TG156.8⁺2

Pan Hongji, Luo Defu, Chen Shengyi. Effect of nitride carbonize and oxidize multi-treatment (QPQ) on microstructure and properties of MPS700A steel[J]. Heat Treatment of Metals, 2021, 46(4): 83-87.

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