Title:
AMBIENT-HYDROGEN-LEVEL ASSESSMENT METHOD AND WHITE-STRUCTURE-DAMAGE-LIKELIHOOD PREDICTION METHOD
Document Type and Number:
WIPO Patent Application WO/2020/110593
Kind Code:
A1
Abstract:
Provided are a method for assessing the ambient hydrogen level of a rolling device during operation and a method for predicting the likelihood that white structure damage will occur in the rolling device as a result of operation. From among the operation conditions of a rolling device comprising two rolling members, at least one of which is a steel rolling member, that are in rolling contact with each other, this ambient-hydrogen-level assessment method assesses an ambient hydrogen level that is an index indicating the degree to which hydrogen will affect the rolling device. Further, this ambient-hydrogen-level assessment method comprises a measurement step for, after the rolling device has been operated under the operating conditions, measuring the amount of hydrogen that is not diffusible at room temperature included in a region of the steel rolling member of the rolling device where rolling fatigue has been produced by rolling contact, and an assessment step for assessing the ambient hydrogen level on the basis of the measurement result of the measurement step.
Inventors:
YAMADA HIROKI (JP)
IMAI ATSUSHI (JP)
UYAMA HIDEYUKI (JP)
IMAI ATSUSHI (JP)
UYAMA HIDEYUKI (JP)
Application Number:
PCT/JP2019/042833
Publication Date:
June 04, 2020
Filing Date:
October 31, 2019
Export Citation:
Assignee:
NSK LTD (JP)
International Classes:
F16C19/52; G01M13/04; G01N17/00
Foreign References:
| JP2004278782A | 2004-10-07 | |||
| JP2017122633A | 2017-07-13 | |||
| JPH1194704A | 1999-04-09 | |||
| US20140157874A1 | 2014-06-12 | |||
| JP2019035756A | 2019-03-07 | |||
| JP6072504B2 | 2017-02-01 |
Other References:
HISAO MATSUNAGA, HIROKI KOMATA, JUNICHIRO YAMABE, SABURO MATSUOKA: "OS2107 Effect of hydrogen 011 shear-mode fatigue crack growth in rolling contact fatigue of a bearing steel", PROCEEDINGS OF THE MATERIALS & MECHANICS CONFERENCE, no. 13-8, 10 October 2013 (2013-10-10), pages 1 - 2, XP009526035, DOI: 10.1299/jsmemm.2013._OS2107-1_
See also references of EP 3889569A4
See also references of EP 3889569A4
Attorney, Agent or Firm:
TANAKA Hidetetsu et al. (JP)
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