Analysis of chemical compoung and maechanical field during nitriding

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560118
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: Saitama Institute of Technology (2013-2014); Fukuyama University (2012)
• Principal Investigator: INOUE Tatsuo 埼玉工業大学, 付置研究所, 教授 (10025950)
• Co-Investigator(Kenkyū-buntansha): UEHARA Takuya 山形大学, 理工学研究科, 教授 (50311741) ; WATANABE Youichi 仙台高等専門学校, その他の部局等, その他 (60515154) ; MUKAI Ryuji 埼玉工業大学, 公私立大学の部局等, その他 (40398540)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 窒化 / 窒化物 / 相変態 / 体積膨張 / 固有ひずみ / 残留応力

Outline of Final Research Achievements

Final goal of this project is to formulate a method to evaluate stress, or residual stress induced in the steel substrate in nitriding process. Non-equilibrium state is considered, in the first paper, to simulate nitrogen concentration successively by simple diffusion into α-Fe in the first stage of the process followed by formation of γ’ and ε compounds associated with phase transformation due to crystallographic structure change. The volume dilatation by such diffusion and phase change processes is estimated, where emphasis is placed on that by considering the nitrogen dependence on lattice parameters for each unit cell. The volume dilatation thus evaluated is to be used to formulate elastic plastic strain and stress in the final part.

Free Research Field

工学