Effect of nitrogen content on microstructure and properties of high nitrogen CrMnMo austenitic stainless steel

doi:10.13251/j.issn.0254-6051.2020.01.032

Abstract

Abstract: High nitrogen CrMnMo austenitic stainless steels with nitrogen content of 0.008%-0.77% were designed and smelted with 18Cr14Mn3Mo steel as the basic composition. The effect of N content on the hardness, scratch resistance, plasticity and strength was studied by means of mechanical properties test, metallographic observation and scanning electron microscopy. The results show that when the N content is 0.42% or less, the microstructure is austenite plus a certain amount of ferrite, and the existence of such ferrite makes both the plasticity and the toughness of the steel poorer. The steel with 0.77%N has the highest hardness of 273 HV0.5 and the best scratch resistance. The steel with 0.59%N has the best plasticity and toughness with the percentage reduction of area after fracture of 79% and the impact absorbed energy of 422 J. Comprehensively considering, the optimum N content of the high nitrogen CrMnMo austenitic stainless steel is 0.77%.

Key words: high nitrogen steel, nitrogen content, mechanical properties, plasticity, hardness, microtructure

CLC Number:

TG142.1

Weng Jianyin, Dong Han, Li Bei, Bao Xianyong, Ning Xiaozhi. Effect of nitrogen content on microstructure and properties of high nitrogen CrMnMo austenitic stainless steel[J]. HTM, 2020, 45(1): 160-163.

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