2013 Fiscal Year Final Research Report
Compound surface-modification technique combined DLC film coating and martensitic trasnformation with dispersed-precipitated carbonitrides
| Project/Area Number |
23560881
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Material processing/treatments
|
|---|
| Research Institution | Sendai National College of Technology |
|---|
Principal Investigator |
WATANABE Youichi 仙台高等専門学校, マテリアル環境工学科, 客員教授 (60515154)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
KUMAGAI Susumu 仙台高等専門学校, マテリアル環境工学科, 准教授 (30390389)
ASADA Kaku 仙台高等専門学校, マテリアル環境工学科, 教授 (20300519)
|
|---|
| Project Period (FY) |
2011 – 2013
|
| Keywords | 表面改質 / 鉄鋼 / 浸炭窒化 / 窒素 / DLC |
|---|
| Research Abstract |
A hybrid surface-modification technique with a combination of vacuum carbonitrided martensitic-transformation and a DLC film coating was investigated using Cr-Mo steel designed for carbonitriding to high nitrogen content.
Very fine martensite having solute-nitrogen, retained austenite, dispersed-precipitated CrN, Fe4N and Fe3C, was obtained by vacuum-carbonitrided-quenching of the Cr-Mo steel.
The results of a roller-pitting fatigue test show that each of a DL film (deposited by linear-ion-source:LIS method), a Si-doped DLC film coating and nitrogen-implantation (performed by plasma-based ion implantation; PBII, and deposition; PBIID methods) improve the pitting endurance of the steel vacuum carbonitrided with a nitrogen content of 0.41-0.55%, especially under a Hertz's pressure (Pmax) of more than 4.2GPa.
|
