Strengthening of Low Carbon Alloy Steel Nitrided Gear by Generating γ’-Fe₄N Phase


A high strength nitrided gear was developed in controlled gas-nitriding process for creating the γ’-Fe₄N phase compound layer and designing the material composition so as to minimize the hardness difference between compound layer and substrate, and to set the optimum hardness profile for the gear. The created compound layer is controlled around HV800 by low carbon steel with the Mn, Cr and V content in the material. As a result, the developed nitrided gear achieves at least 50% higher pitting fatigue strength than a conventional nitrocarburized gear, and same strength level with conventional carburized gear.従来のガス軟窒化ギヤに比べ50%以上高い面疲労強度を有し,浸炭ギヤ同等の高強度窒化ギヤを開発した.これは,新たに開発された制御窒化によって表層にγ’-Fe₄N化合物層を形成し,且つ化合物層硬度と直下母材の硬度差を極小化させるために材料の合金成分を低炭素Mn-Cr-Vに最適化されたものである.


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  • Accession Number: 01670804
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Jan 31 2018 3:20PM