Browse > Article
http://dx.doi.org/10.5781/JWJ.2015.33.2.40

The effect of ultrasonic nano crystal surface modification for mitigation of the residual stress after weld inlay on the alloy 82/182 dissimilar metal welds of reactor vessel in/outlet nozzles  

Cho, Hong Seok (Graduate School of Energy and Environment, Seoul National Univ. of Science & Technology)
Park, Ik Keun (Dept. of Mechanical and Automotive Engineering, Seoul National Univ. of Science & Technology)
Jung, Kwang Woon (Technology Research and Development Institute, KEPCO KPS)
Publication Information
Journal of Welding and Joining / v.33, no.2, 2015 , pp. 40-46 More about this Journal
Abstract
This study was performed to investigate the effect of ultrasonic nano crystal surface modification (UNSM) on residual stress mitigation after Weld Inlay repair for butt dissimilar metal weld with Alloy 82/182 in reactor vessel In/Outlet nozzle. As-welded and Weld Inlay specimens were made in accordance with design standard of ASME Code Case N-766, and two planes of their weld specimens were peened by the optimum UNSM process condition. Peening characteristics for weld specimens after UNSM treatment were evaluated by surface roughness and Vickers hardness test. And, residual stress for weld specimens developed from before and after UNSM treatment was measured and evaluated by instrumented indentation technique. Consequently, it was revealed that the mitigation of residual stress in weld metal after Weld Inlay repair of reactor vessel In/Outlet nozzle could be possible through UNSM treatment.
Keywords
Reactor vessel nozzle; Alloy 82/182; PWSCC; Weld Inlay; UNSM; Residual stress;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Materials Reliability Program-114 : Evaluation of the effect of weld repairs on dissimilar metal butt welds, Electric Power Research Institute, (2006)
2 Materials Reliability Program-220 : Review of stress corrosion cracking of alloys 182 and 82 in PWR primary water service, Electric Power Research Institute, (2006)
3 Takehisa Hino, Masataka Tamura, Yoshimi Tanaka, Wataru Kouno, Yoshinobu Makino, Shohei Kawano and Keiji Matsunaga: Development of underwater laser cladding and underwater laser seal welding techniques for reactor components, Journal of Power and Energy Systems, 3(1) (2009), 51-59   DOI
4 Xudong Zhang, Eiji Ashida, Susumu Shono and Fukuhisa Matsuda: Efffect of shielding conditions of local dry cavity on weld quality in underwater Nd:YAG welding, Journal of Materials Processing Technology, 174 (2006), 34-41   DOI   ScienceOn
5 Sang-Chul Kim and Mann-Won Kim: PWSCC crack growth analysis using numerical method in the inner surface repair weld of nozzle, Journal of KWJS, 29(2) (2011), 64-71
6 ASME Code Case N-766
7 ASME Code Case N-803
8 Materials Reliability Program-121: Mechanical stress improvement process (MSIP) implemention and performance experience for PWR applications, Electric Power Research Institute, (2006)
9 Arvi Kruusing: Underwater and water-assisted laser processing: Part 1-general features, steam cleaning and shock processing, Optics and Lasers in Engineering, 41 (2004), 307-327   DOI   ScienceOn
10 Jialei Zhu, Xiangdong Jiao, Canfeng Zhou and Hui Gao: Applications of underwater laser peening in nuclear power plant maintenance, Energy Procedia, 16 (2012), 153-158   DOI   ScienceOn
11 Materials Reliability Program-162: An evaluation of surface stress improvement technologies for PWSCC mitigation of Alloy 600 nuclear components, Electric Power Research Institute, (2006)
12 Materials Reliability Program-267: Technical basis document for primary stress corrosion crackiing mitigation by surface treatments, Electric Power Research Institute, (2010)
13 Amrinder Gill, Abhishek Telang, S.R. Mannava, Dong Qian, Young-Shik Pyoun, Hitoshi Soyama and Vijay K. Vasudevan: Comparison of mechanisms of advanced mechanical surface treatments in nickel-based superalloy, Materials Science & Engineering A, 576 (2013), 346-355   DOI   ScienceOn
14 Min-Soo Suh, Young-Shik Pyoun and Chang-Min Suh: Variation of fatigue properties in nanoskinned Ti-6Al-4V-Rotating bending and axial loading tension- compression cycle-, Journal of the Korean Society of Mechanical Engineers, 36(4) (2012), 443-449   DOI   ScienceOn
15 Young-Shik Pyoun, Jeong-Hyeon Park, In-Ho Cho, Chang-Sik Kim and Chang-Min Suh: A study on the ultrasonic nano crystal surface modification (UNSM) technology and it's application, Journal of the Korean Society of Mechanical Engineers, 33(3) (2009), 190-195   DOI   ScienceOn
16 ASME Boiler and Pressure Code Section II Part A, C, 2010 Edition
17 Chang-Soon Lee, In-Gyu Park, In-Sik Cho, Jung-Hwa Hong, Tae-Gu Jhee and Young-Shik Pyoun: Rolling contact fatigue and residual stress properties of SAE52100 steel by untrasonic nano-crystal surface modification (UNSM), Journal of the Korean Society for Heat Treatement, 21(1) (2008), 10-19
18 Won-Seok Song, Seung-Gyu Kim, Hee-Jun Ahn, Kwang-Ho Kim and Dong-Il Kwon: A study on utilizing instrumented indentation technique for evaluating infield integrity of nuclear structures, Journal of the Korean Society for Nondestructive Testing, 33(2) (2013), 165-172   DOI   ScienceOn