Effect of repair welding on the microstructure of service exposed naphta cracking tubes made of 25/35 Nb W Si iron base superalloy

Demirel, Erhan


Effect of weld repair on microstructure and mechanical properties of API 5LX65 steel
Batıgün, Caner; Demircan, M.; Gür, Cemil Hakan (null; 2010-12-01)
Weld repair is a common technique to remove defects in the weldments. However, particularly in the high strength low alloy steels (HSLA), heat input during weld repair causes complex changes in the microstructure and mechanical properties. In this study, the influences of repeated heat input and thermal cycle upon repair weld on the microstructure and mechanical properties of the welded joints of API 5L X65 were investigated via optical microscopy, scanning electron microscopy; Charpy-V impact, Vickers hard...
Effect of microstructure on fracture toughness of coarse grain heat aff ected zone in as welded X70M steel
Cagırıcı, Mehmet; Tosun, Uygar; Gür, Cemil Hakan (null; 2016-10-01)
Fracture toughness behavior of coarse-grain heat affected zone (CGHAZ) of the welds in API5LX70M pipes has been investigated by Charpy impact and crack tip opening displacement (CTOD) tests at -10°C. The present work also includes comprehensive pre- and post-test metallography and analyses. A correlation between local brittle and soft spots in intercritically reheated coarse-grain heat affected zone (ICCGHAZ) and toughness of the as-welded material has been observed. The degree of dilution and the microstru...
Effect of solidification rate on microstructure and primary carbides of AISI DC 53 cold work tool steel
Cardakh, Ismail Seckin; Kalkanlı, Ali (Springer Science and Business Media LLC, 2019-05-01)
The solidification behavior of AISI DC 53 cold work tool steel was investigated by means of a cooling curve and its first derivative. Copper and sand wedge-shaped molds were used to obtain various solidification rates. To reveal the cooling rate degree during solidification, the secondary dendrite arm spacing of the steel alloy was examined by scanning electron microscopy (SEM). The solidification rates of each section for both wedge steel samples were calculated by means of the secondary dendrite arm spaci...
Effect of prolonged heating at 130 degrees C on fatigue crack propagation of 2024 Al alloy in three orientations
Sarioglu, F; Orhaner, FO (Elsevier BV, 1998-06-15)
An AI-Cu alloy 2024 received in T3 condition (cold worked after solutionizing and natural aging) was heated at 130 degrees C for 100 and 1000 h. Fatigue crack growth tests were carried out before and after heating with center cracked tension specimens machined in L-T, T-L and 60 degrees orientations. Fracture surfaces were studied by means of scanning electron microscopy. It was found that the fatigue crack growth rate depends on the test direction in T3 condition. The orientation effect seemed to be lost a...
Effect of Fly Ash Fineness on the Activation of Geopolymer Concrete
Aleessa Alam, Burhan; Yaman, İsmail Özgür (2012-10-05)
In the field of construction materials and particularly in concrete, cement is considered as a key element since it generates a strong and durable material through a simple hydration process. However, for many reasons (mainly economic and environmental) researchers are trying to find a new material that could replace cement or at least part of it as a binding agent in concrete. Regarding this issue, cement replacement materials like fly ash and slag have taken the lead during the last few decades. These mat...
Citation Formats
E. Demirel, “Effect of repair welding on the microstructure of service exposed naphta cracking tubes made of 25/35 Nb W Si iron base superalloy,” Middle East Technical University, 1996.