Title:
NITRIDE STEEL MEMBER AND METHOD FOR MANUFACTURING NITRIDE STEEL MEMBER
Document Type and Number:
WIPO Patent Application WO/2016/182013
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a technique for producing a thicker compound layer composed primarily of a γ' phase, even when the customary duration of gas nitriding treatment is employed; the fatigue strength can be improved by carrying out film thickening; and a nitriding-treated member having improved wear resistance while being endowed with higher fatigue strength than in the prior art is possible. Provided are a nitride steel member having an iron nitride compound layer formed on the surface of a steel member comprising a steel component that gives rise to a primarily γ' phase compound layer, wherein the primarily γ' phase-based compound layer in which the proportion in which the γ' phase is present, when this value is expressed as a ratio defined by Vγ'/(Vγ' + Vε), where Vγ' and Vε denote the volume proportions of the γ' phase and the ε phase present in the iron nitride compound layer, is 0.5 or greater has a thickness of 13 μm-30 μm; and the value of the thickness of the compound layer following gas nitriding treatment, represented by the CLT of the iron nitride compound layer, satisfies the relationship CLT ÷ DLT ≥ 0.04. where DLT represents the value of the practical hardening depth of the nitrided diffusion layer subsequent to gas nitriding treatment; and a method for manufacturing the same.
Inventors:
HIRAOKA YASUSHI (JP)
WATANABE YOUICHI (JP)
WATANABE YOUICHI (JP)
Application Number:
PCT/JP2016/064100
Publication Date:
November 17, 2016
Filing Date:
May 12, 2016
Export Citation:
Assignee:
PARKER NETSUSHORI KOGYO CO LTD (JP)
International Classes:
C23C8/26; C21D1/06; C21D9/30; C21D9/32; C22C38/00; C22C38/58
Domestic Patent References:
| WO2015046593A1 | 2015-04-02 |
Foreign References:
| JP5669979B1 | 2015-02-18 |
Other References:
TAKAAKI UMEDA ET AL.: "Development of Manufacturing Technology for Nitriding Processes Using Nitriding Potential Control", KOMATSU TECHNICAL REPORT, vol. 60, no. 167, 2014, pages 17 - 23, XP055328950
YASUSHI HIRAOKA ET AL.: "Chikka Potential Seigyo shita Gas Chikka Shori ni yoru Tei Gokinko no Kagobutsu Soso Kozo Seigyo", NETSU SHORI, vol. 55, no. 1, 28 February 2015 (2015-02-28), pages 1 - 2
YASUSHI HIRAOKA ET AL.: "Chikka Potential Seigyo shita Gas Chikka Shori ni yoru Tei Gokinko no Kagobutsu Soso Kozo Seigyo", NETSU SHORI, vol. 55, no. 1, 28 February 2015 (2015-02-28), pages 1 - 2
Attorney, Agent or Firm:
KONDO Rieko et al. (JP)
Kondo Toshihide child (JP)
Kondo Toshihide child (JP)
Download PDF:
Previous Patent: ALUMINA SINTERED BODY AND OPTICAL ELEMENT BASE SUBSTRATE
Next Patent: OPERATION DETECTION DEVICE
Next Patent: OPERATION DETECTION DEVICE