Reduced pressure quenching oil and distortion
- Nippon Grease Co., Ltd., Kobe (Japan)
- Toyota Motor Corp., Aichi (Japan)
Cooling process observed in a quenching oil`s cooling curve determination by JIS silver probe method, has been divided into three stages, vapor blanket stage, boiling stage and convection stage. Under reduced pressure vaporization is accelerated and extend the vapor blanket stage which shift the position of boiling stage the fastest of cooling speed among the cooling process toward low temperature side. Taking advantage of this behavior in quenching under reduced pressure, it is possible to improve quench hardenability by controlling reduced pressure. Vapor pressure of quenching oil increases under very high vacuum and accelerates vapor blanket formation and covers the material with more vapor blanket, resulting in reduction of cooling speed. Excessive vapor blanket covering the material will lead to partially uneven quenching of the treated material caused by uneven conditions by partial decomposition. Making vapor blanket distribution more even and to optimize uniform coating condition enables to prevent heat treatment distortion caused by uneven quenching conditions.
- OSTI ID:
- 484283
- Report Number(s):
- CONF-961140-; TRN: 97:000168-0045
- Resource Relation:
- Conference: 2. international conference on quenching and the control of distortion, Cleveland, OH (United States), 4-7 Nov 1996; Other Information: PBD: 1996; Related Information: Is Part Of 2nd International conference on quenching and the control of distortion; Totten, G.E.; Howes, M.A.H.; Sjoestrom, S.J.; Funatani, Kiyoshi [eds.]; PB: 652 p.
- Country of Publication:
- United States
- Language:
- English
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