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A Study on Advanced Small Punch Test for Evaluation of Fracture Strength in Beat Resisting Steel Weldment  

이동환 (전북대학교 대학원 정밀기계공학과)
이송인 (전북대학교 기계항공시스템공학부, 자동차신기술연구센터)
권일현 (전북대학교 기계항공시스템공학부, 자동차신기술연구센터)
유효선 (전북대학교 기계항공시스템공학부, 자동차신기술연구센터)
Publication Information
Journal of Welding and Joining / v.20, no.6, 2002 , pp. 823-829 More about this Journal
Abstract
In order to evaluate the proper fracture strength of microstructures in a steel weldment, smaller size loading ball than used for a conventional small punch(CSP) testing is required due to regional limitation on constitutive structures. In this study, the minimized loading ball(${\varphi}1.5mm$) and bore diameter of lower die(${\varphi}3mm$) were designed for an advanced small punch(ASP) test. The results obtained from the ASP test were compared with those from a CSP testing for a X20CrMoV121 steel weldment. It was found that the ASP test clearly showed the microstructural dependance on fracture strength and ductile-brittle transition behavior of the weldment. In the ASP test, especially, the cracks tend to initiate for various directions within hemispherical indentation region of an objective structure in SP test. This indicates that the evaluation of more proper fracture strength for F.L+CGHAZ, FGHAZ and ICHAZ can be performed by means of the ASP test in a steel weldment.
Keywords
Advanced small punch(ASP) test; Heat resisting steel weldment; F.L; CGHAZ; FGHAZ; ICHAZ; Fracture strength; DBTT; X20CrMoV121 steel;
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