ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The purpose of this study is to find out the AE characteristics and fracture mechanismsthrough AE signal analysis for the weldment, PWHT specimen and basemetal of the pressure vesselsteel. Charpy sized specimens were taken from the multi-passed weld block. Specimens were givento four point bend and AE tests. Lots of AE signals were emitted from the weldment compared withthe basemetal and PWHT specimen. Besides, amplitude for the weldment was the largest, followedby PWHT specimen and basemetal and more AE counts for the weldment were emitted in theprocess of deformation. Lots of microcracks around the notch for the weldment were formed so thatmore AE signals were produced. In addition, second phase particle such as MgO for the basemetalacts as AE source. However, in case of weldment, debonding mechanisms between matrix and hardoxides which are formed during welding in air attributed to the emission of AE signals and softenedparticles for the PWHT specimen cause to produce the low level AE signals
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.1181.pdf
