한국해양대학교

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PTA 공법에 의한 Nimonic 초합금재의 표면개질에 관한 연구

Title
PTA 공법에 의한 Nimonic 초합금재의 표면개질에 관한 연구
Alternative Title
A Study on the? Surface Modification of the Nimonic Super Alloy by Plasma Transferred Arc Welding Method
Author(s)
황원석
Publication Year
2008
Publisher
한국해양대학교 대학원
URI
http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002174395
http://repository.kmou.ac.kr/handle/2014.oak/8411
Abstract
PTA overlay is a relatively new process. And it has been spotlighted for its ability to make high functioning overlay layer using high temperature melting powder of alloy and carbide, which previous welding process can not do.

However, to broaden the application of this process, something more is required. That is study of the effect of process variable upon overlay layer, and quantitative analysis of overlay layer's characteristics when this process is used.

Regarding this study, Although it has been reported that Ni-base and Co-base alloy's abrasive behavior upon PTA overlay layer, the effect of high temperature exposure has not been brought to light yet.

So, this study aimed for settling overlay process upon internal-combustion engine's suction, exhaust valve surface based on PTA process. Consequently, we constructed PTA overlay layer on Nimonic material surface using Ni-base super alloy powder, and studied characteristics in micro-structure, abrasion-resistance, abrasion characteristics after high temperature exposure and cavitation resistance upon that overlay layer. Also we examined the cause of hot cracking after PTAW and searched a method to prevent it.
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재료공학과 > Thesis
Files in This Item:
000002174395.pdf Download

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