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Open AccessArticle

Thick β-SiC CVD-Coated SiC Die System for Dry Cold Forging of Metals

1
Surface Engineering Design Laboratory, Shibaura Institute of Technology, Tokyo 144-0045, Japan
2
Komatsu-Seiki Kosakusho, Co., Ltd., Nagano 392-0022, Japan
3
Tokai Engineering Service, Co., Ltd., Gifu 504-0852, Japan
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(6), 539; https://doi.org/10.3390/cryst10060539
Received: 4 May 2020 / Revised: 20 June 2020 / Accepted: 23 June 2020 / Published: 24 June 2020
(This article belongs to the Special Issue Development and Investigation of SiC and SiC-based devices)
A thick β-SiC CVD (chemical vapor deposition)-coated SiC device was developed as a new punch and die system for dry, cold forging of pure titanium and austenitic stainless-steel works. This β-SiC coating thickness was 4 mm, enough to make mechanical machining of a cavity into β-SiC coating core die. These β-SiC-coated punch and core dies were fixed into the cassette die for dry, cold forging experiments. The stainless steel and titanium wires with diameters of 1.0 mm were employed as the work material. Different from the conventional metallic and ceramic die systems suffering from work material transfer, this system sustained the galling-free cold, dry forging behavior up to a higher reduction of thickness than 30%. The power to stroke the relationship was in situ monitored to describe this forging behavior up to the specified reduction of the wires together with observations on the geometric change from a circular wire to a pentagonal prism bar. Precise scanning electron microscopy-electron-dispersive X-ray spectroscopy (SEM-EDX) analyses were performed to describe the material compatibility on the contact interface between β-SiC coating and elastoplastically deforming works. View Full-Text
Keywords: thick β-SiC coating; chemical vapor deposition; punch and die system; dry, cold forging; galling-free forging; titanium; stainless steel; oxide debris particles; carbon isolation thick β-SiC coating; chemical vapor deposition; punch and die system; dry, cold forging; galling-free forging; titanium; stainless steel; oxide debris particles; carbon isolation
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MDPI and ACS Style

Aizawa, T.; Yoshino, T.; Ito, K.-I.; Fukuda, T. Thick β-SiC CVD-Coated SiC Die System for Dry Cold Forging of Metals. Crystals 2020, 10, 539.

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