Volume 8, Issue 4 (december 2011)                   IJMSE 2011, 8(4): 27-33 | Back to browse issues page

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A. Mohassel, A. H. Kokabi, P. Davami. MECHANICALAND METALLURGICAL PROPERTIES OFWIDE-GAP ALUMINOTHERMIC RAILWELDS. IJMSE 2011; 8 (4) :27-33
URL: http://ijmse.iust.ac.ir/article-1-387-en.html
MECHANICALAND METALLURGICAL PROPERTIES OFWIDE-GAP ALUMINOTHERMIC RAILWELDS
A. Mohassel , A. H. Kokabi , P. Davami
Abstract:   (45910 Views)
The wide-gap aluminothermic rail welds with root opening of 50-70 mm were produced using plain carbon steel rail and non-alloy aluminothermic charge. Mechanical properties and micro-structure of the weld metal and HAZ as well as the impact energy and the fracture toughness of the welds were investigated. The yield and tensile strength of wide-gap welds were about 98% and 95% of the base metal, respectively. Both minimum and maximum hardnesses of the joint were seen in HAZ which were related to the grain coarsening and normalizing, respectively. The mean value of wide-gap weld fracture toughness is more than narrow-gap weld. Moreover, trans-granular cleavage indicated the brittle fracture mode of the weld metal.
Keywords: Wide-gap weld, Aluminothermic weld, Fracture toughness, Microstructure.
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Type of Study: Research Paper | Subject: materials engineeing and special subjects
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