Development of New Modified “Super Saturated NitroCarburizing” for Modern High Pressure Injector in Powertrain

Park, Heon-Joon; Cha, SungChul; Kim, SeHeon

doi:10.4271/2018-01-1408

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…Materials of injector shall have resistances for high pressure, high temperature, corrosion, and abrasion. The stopper and position ring are continuously impacted by the vertical motion of adjacent parts during operation and are currently applying expensive carburizing heat treatment [21,25,26]. Thus, it is necessary to develop a cost-effective heat treatment.…”

Section: Effects Of Molybdenum On Hardening Properties Of Stainless S...mentioning

confidence: 99%

“…Low-temperature vacuum carburizing was carried out for 24 h (including heating and cooling times) with a carburizing potential (Kc) of 0.32 at a working pressure of 800 Pa and a temperature of 450°C. Process conditions were partly used as reported in previous work [25,26], and further optimized.…”

Section: Effects Of Molybdenum On Hardening Properties Of Stainless S...mentioning

confidence: 99%

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Current Development of Automotive Powertrain Components for Low Friction and Wear Reduction through Coating and Heat Treatment Technology

Chul¹,

Moon²,

Yoon³

2023

Advances in Rheology of Materials

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Recent findings of R&D for powertrain components concerning friction and wear reduction are described in this chapter. These are realized through lubrication technology of coating and heat treatment, which are fit for this book. In the first part, nano-complex coatings for parts of future mobility are presented with their friction and wear behavior. The application of an alloying target was proposed to promote the commercial use of nanocomposite coatings. In the second part, the importance on pre-treatments-related silicon oxide-diamond-like carbon (SiO-DLC) coating for the smallest part of fuel system is described. The optimization of cleaning for the balls before coating was resulted: The best cleaning performance presented the addition of acetone cleaning, water boiling, and then acetone cleaning, confirmed by fluorescence analyzers. The third part of this work was developing low-temperature vacuum carburizing and pre-treatment for parts of injector, stopper (SUS303), and position ring (1.4305) with high wear resistance. The difference between two steels led to the result: high molybdenum of 1.4305 formed Mo-oxides on the surface during acid etching. These Mo-oxides resolved quickly by hydrogen during carburizing and then enabled activated carburizing. The 1.4305 was appropriate for the carburizing and was chosen for stopper.

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Section: Effects Of Molybdenum On Hardening Properties Of Stainless S...mentioning

confidence: 99%

Section: Effects Of Molybdenum On Hardening Properties Of Stainless S...mentioning

confidence: 99%

Current Development of Automotive Powertrain Components for Low Friction and Wear Reduction through Coating and Heat Treatment Technology

Chul¹,

Moon²,

Yoon³

2023

Advances in Rheology of Materials

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show abstract

“…Materials of injector shall have resistances for high pressure, high temperature, corrosion and abrasion. Stopper and position ring are continuously impacted by the vertical motion of adjacent parts during operation, and are currently applying expensive carburizing heat treatment [2][3][4]. Thus, it is necessary to develop the cost effective heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Effects of Molybdenum on Hardening Properties of Stainless Steels by Low Temperature Vacuum Carburizing and Pre-Treatment

Chul

Park

Jung

et al. 2021

Heat Treat 2021: Extended Abstracts From the 31st Heat Treating Society Conference and Exposition

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To develop low temperature vacuum carburizing for next generation of injector parts was the aim of this work. Concerned parts were stopper (SUS303) and position ring (1.4305) with current properties of carburized thickness of av. 22.7 μm and hardness of HV0.05 av. 935.New carburizing and pickling were developed to reduce the cost and improve product quality. Especially, both steels showed different pitting and oxide regeneration behavior during pickling due to the composition difference. In the case of SUS 303, MnS inclusions at the surface led to severe MnS pitting, in contrast, 1.4305 formed Mo-oxides on the surface during pickling, which the excessive pitting by MnS inclusion site was prevented, confirmed by OM, SEM-EDX and XPS. Furthermore, these oxides resolved easily by hydrogen during carburizing and subsequently enabled activated carburizing. In conclusion, 1.4305 showed excellent properties, hardness of 985 HV0.05, thickness of 23 μm incl. satisfaction of weldability.

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Development of New Modified “Super Saturated NitroCarburizing” for Modern High Pressure Injector in Powertrain

Cited by 2 publications

References 9 publications

Current Development of Automotive Powertrain Components for Low Friction and Wear Reduction through Coating and Heat Treatment Technology

Current Development of Automotive Powertrain Components for Low Friction and Wear Reduction through Coating and Heat Treatment Technology

Effects of Molybdenum on Hardening Properties of Stainless Steels by Low Temperature Vacuum Carburizing and Pre-Treatment

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