Case Study of Crack Problem of Silver Sterling from Cold Working Process

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Siriporn Rojananan
King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140
Surasit Rojananan
King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140
Chalongchai Photinakae
King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140
Weerapat Thamcharoen
King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140
Apichart Darakai
King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Abstract

This paper presents an investigation on crack problem identification of silver sterling from acold working process. Mechanical properties and microstructures were examined. The resultsshowed that tensile strength, hardness and percent elongation ranged from 188-202 MPa, 90-105HB, and 7-11, respectively. Metallographic investigation showed that phase distribution exhibitedinhomogeneous phases, containing α-Ag-rich phase and eutectic structure and cracks. EDS analysiswas carried out on the matrix and the crack interface areas. EDS spectrum showed peaks of Ag,Cu, C, O and Ag, Cu, C, O, Si, Cr, B, Fe, Ta, Al, respectively. Moreover, EDS spectrum on particleshowed peaks of Ca C and O. The experimental results indicated that the presence of theinhomogeneous distribution of high melting point elements has a significant effect on the crackingof the silver sterling.

Keywords : Crack / Silver / Cold Work / Silver Sterling

Article Details

Issue
Vol. 29 No. 4 (2006): October - December
Section
Original Articles
Author Biographies

Siriporn Rojananan, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Lecturer, Division of Materials Technology, School of Energy Environment and Materials.

Surasit Rojananan, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Lecturer, Department of Tool and Materials Engineering.

Chalongchai Photinakae, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Student, Department of Tool and Materials Engineering.

Weerapat Thamcharoen, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Student, Department of Tool and Materials Engineering.

Apichart Darakai, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Student, Department of Tool and Materials Engineering.