English  |  正體中文  |  简体中文  |  Items with full text/Total items : 26999/38800
Visitors : 2398948      Online Users : 54
RC Version 4.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search
LoginUploadHelpAboutAdminister

Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/9462

Title: 精密傳動元件雷射處理技術研究---子計畫II:高強度硬化鋼雷射表面退火處理研究
Laser Surface Annealing of High Strength Hardened Steel
Authors: 蔡履文
Contributors: NTOU:Institute of Materials Engineering
國立臺灣海洋大學:材料工程研究所
Keywords: 雷射表面處理;變態硬化;熱循環;退火;沃斯田鐵化溫度
Laser surface treatment;Tranformation hardening;Thermal cycling;Annealing;Austenizing temperature
Date: 1999
Issue Date: 2011-06-28T07:09:15Z
Publisher: 行政院國家科學委員會
Abstract: 本研究是針對超高強度麻時效鋼,施以雷射處理以改善氫脆抵抗能力。時效硬化的試片經雷射表面退火處理後,形成特殊之複合區域,由外圍表面軟化的雷射退火區域及內部硬化母材區所組成。實驗結果顯示:在大氣中,母材有較佳的拉伸性質,但在硫化氫環境中,雷射表面退火試片的強度反而比母材高。另一方面,由於殘留應力作用,雷射退火處理試片在複合區域其疲勞裂縫成長速率均較母材為低,另一方面,材料之氫脆敏感性亦可獲得改善。
This paper shows that laser beam irradiation improves resistance to hydrogen embrittlement (HE) in a T-250 maraging steel. Localized laser irradiation of a peak-aged steel plate resulted in the formation of a soft surface layer called the laser-annealed zone (LAZ). A composite region (CR) was formed when both the top and bottom surfaces of a specimen were laser-annealed (L-A) to leave an interior layer of untransformed base metal (BM) sandwiched between the two LAZs. Slow strain rate tensile (SSRT) tests showed that the soft LAZs showed less susceptibility to HE than the BM. The fatigue crack growth rates (FCGRs) in the CR were lower than those in the BM regardless of testing environment and stress (R) ratio. The retarded crack growth in the CR was attributed to the presence of residual compressive stress in the soft LAZs.
Relation: NSC88-2216-E019-001
URI: http://ntour.ntou.edu.tw/ir/handle/987654321/9462
Appears in Collections:[材料工程研究所] 研究計畫

Files in This Item:

File Description SizeFormat
RRPB88010621.pdf358KbAdobe PDF287View/Open
index.html0KbHTML69View/Open


All items in NTOUR are protected by copyright, with all rights reserved.

 


著作權政策宣告: 本網站之內容為國立臺灣海洋大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,請合理使用本網站之內容,以尊重著作權人之權益。
網站維護: 海大圖資處 圖書系統組
DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback