Development of new modified “Super Saturated NitroCarburizing” for modern high pressure injector in powertrain

Paper #:
  • 2018-01-1408

Published:
  • 2018-04-03
Abstract:
The aim of this work is to investigate the current expensive heat treatment “Kolsterizing” and subsequently to develop new modified inexpensive heat treatment with increase of material properties. Considered parts are stopper (SUS303) and position ring (1.4305) of high pressure injector in powertrain. With development of new modified heat treatment the supply chain shall be multiple and therefore stable. At first current Kolsterizing is investigated and resulted: hardness (HV50) 804-913, layer thickness of 16,1-21,52 ㎛, corrosion resistance was maximum 1 hour at 8.25% NaCl solution. New modified heat treatment is Super Saturated NitroCarburizing (SSNC) which is generated with nitrogen and carbon sourcing gas in temperature range of 350-450 ℃. The process in detail is: nitrogen purging and heating, activation at 360℃ for 1 hour, heating, nitrocarburizing at 350-450℃ for 4-48 hours, cooling. At the subsurface carbon rich S-phase is formed and at surface nitogen rich S-phase is formed. As result the SSNC layer has 1.258-1.461 HV50, thickness of 17,27-23,96 ㎛. Their corrosion resistance was approximately 3,5 times more resistant than the current one. In conclusion the new modified SSNC heat treatment shows the increase of hardness Min. 300 HV50 and corrosion resistance than "Kolsterizing”. The cost reduction is about 15%.
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