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吳世旭(Sea-Wook Dh),尹漢基(Han-Ki Yoon),張來雄(Rae-Woong Chang),金伎徹(Ki-Chol Kim) 한국해양공학회 1988 韓國海洋工學會誌 Vol.2 No.1
The dynamic fracture toughness, KId, is measured in the heat-treated and ion-nitrided Cr-Mo, Ni-Cr-Mo steel using standard and Precracked Charpy specimens an instrumented impact machine. The value of KId are determined as a fracture of yield strength and microstructure, and correlations are established between KId and both the energy of initiate fracture, and the total energy of fracture. Since the KId values of the pre cracked impact specimens are in accord with their theoretical ones, this testing method is sufficently practical. The effect of ion-nitriding are found to be larger than the heat-treaded specimen.
질화처리가 금형펀치(SKH51)의 마모 특성에 미치는 영향
배대성(Dae-Sung Bae),조상철(Sang-Chul Jo) 산업기술교육훈련학회 2009 산업기술연구논문지 (JITR) Vol.14 No.1
Recently, as the component industry has grown up with the high technology, metallic pattern is needed to have special properties such as precise processing, heat resistance, wear resistance, fatigue resistance and mass product. For these reason, high speed steels with good physical and mechanical properties is favored in the making of the metallic pattern. This study is focused on examining the micro-structure of nitrided case and relationship variation of hardening and wear behavior generated by vacuum heat treatment to grasp the properties of high speed steel for metallic pattern. Also, to understand the effect of ion nitriding for wear resistance of high speed steels the experiment to examine how much microstructure of nitrided layer and hardness variation affect on the wear behavior was conducted according to the ion nitrided treatment and behavior of compound layer and precipitation layer constituting nitrided layer. The results of experiment are as follows: The optimal austenitizing temperature reached at 1250℃ under the condition of the hardness value and surface of roughness in 1,170 ℃ and absorption energy showed 1,170℃ in the case of 1,100℃. Ion nitrided specimen, under these experimental condition, shows the existence of the area of two phases with matrix and carbides and also shows the value of W, Mo, Cr and V components higher in these area. The ruling wear mechanism turned out to be adhesion wear before ion nitriding specimen to be tempered repeatedly twice after quenching and sub-zero treatment but it is abrasive wear and the wear resistance is more enhanced after that process.
플라즈마 이온증착 기술을 이용한 스테인리스강의 질화처리에 관한 연구
박일수(Il-Soo Park),옥철호(Chul-Ho Ok),김재돌(Jae-Dol Kim) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
Plasma immersion ion beam (PUB) nitriding process is an environmentally benign and cost-effective process, and offers the potential of producing high dose of nitrogen ions in a way of simple, fast and economic technique for the high plasma flux treatment of large surface area with nitrogen ion source gas. In this report PUB nitriding technique was used for nitriding on austenite stainless steel of AISI304 with plasma treatment at 250~500℃ for 4 hours, and with the working gas pressure of 2.67 × 10?¹ Pa in vacuum condition. This PUB process might prove the advantage of the low energy high flux of ion bombardment and enhance the tribological or mechanical properties of austenite stainless steel by nitriding. Furthermore, PIIB showed a useful surface modification technique for the nitriding an irregularly shaped three dimensional workpiece of austenite stainless steel and for the improvement of surface properties of AISI 304, such as hardness and strength.