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J. Ocean Eng. Technol. 2009;23(6):105-110.    

Statistical Properties of Vickers Hardness of Post Weld Heat Treated Friction Welded Parts in Alloy718
Kong Yu-Sik,Kwon Hyeok-Yong,Kim Seon-Jin
School of Mechanical Engineering Pukyong National University,Graduate Student School of Mechanical Engineering Pukyong National University,School of Mechanical Engineering Pukyong National University
Alloy718 마찰용접 후열처리재의 비커스 경도의 통계적 성질
공유식,권혁용,김선진
부경대학교 기계공학부,부경대학교 기계공학부 대학원,부경대학교 기계공학부
© 2009 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Post weld heat treatment(PWHT), Vickers hardness, Heat affected zone(HAZ), Probability distribution, Weibull distribution, Variation
핵심용어: 용접후열처리, 비커스경도, 열영향부, 확률분포, Weibull분포, 변동
Abstract
The objective of this paper is to investigate the statistical properties of Vickers hardness (HV) for friction welded parts in a Ni-based super alloy (Alloy718). In the case of post weld heat treatment (PWHT) parts, hardness tests were repeated for three different applied loads, 100, 200, and 300 g, with a duration time of 10 seconds. The arithmetic means of the Vickers hardness in heat affected zone (HAZ) materials were smaller than those of the base metal (BM) in all of the applied loads. The coefficient of variation (COV) for the BM and HAZ decreased by increasing the applied load. The probability distribution of the Vickers hardness followed the Weibull distribution well. The distribution of the Vickers hardness was not found to be symmetric. The shape parameter and scale parameter increased by increasing the applied load at both the BM and HAZ.


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