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:: Volume 6, Issue 1 (5-2019) ::
تبدیل انرژی 2019, 6(1): 17-21 Back to browse issues page
Welding joints of Hastelloy B-2 super alloy by GTAW method and investigation of the microstructure and mechanical properties
Mahdi Khalasi-Dezfuli, Mehdi Ghobeiti-Hasab , Ali Heidary Moghadam
Dezful Branch, Islamic Azad University, Dezful, Iran.
Abstract:   (588 Views)
In this research, Gas tungsten arc welding (GTAW) on Hastelloy B-2 Superalloy was used to investigate the effect of current type on microstructure and mechanical properties of welded zone. The welding process was performed using two direct and pulsed current and with Hastelloy X filler metal. Optical Microscope (OM) and Scanning Electron Microscope (SEM) were used to investigate the microstructure and Energy Dispersive X-ray Spectroscopy (EDS) was used to analysis the precipitations. The microscopic observation showed that applying pulsed current led to a significant reduction in the size of the dendrites and microstructure in the weld metal. Hardness results showed that with direct current the hardness of weld metal is 300 Vickers while with pulsed current hardness is 330 Vickers. In the tensile test, all samples were fractured softly from the base metal. Also, the specimen welded with pulsed current has better tensile properties (elongation %50, yield strength 434 MPa and  ultimate tensile strength 660 MPa).
Keywords: GTAW process, Hastelloy B-2 superalloy, Microstructure, Hardness, Tensile test.
Full-Text [PDF 873 kb]   (139 Downloads)    
Type of Study: Research | Subject: سایر (برق، عمران، معماری، هیدرولیک، ماشین آلات کشاورزی، ساخت و تولید، متالوژی، ریاضی، فیزیک، شیمی و ...)
Received: 2017/05/2 | Accepted: 2017/05/2 | Published: 2019/06/16
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Khalasi-Dezfuli M, Ghobeiti-Hasab M, Heidary Moghadam A. Welding joints of Hastelloy B-2 super alloy by GTAW method and investigation of the microstructure and mechanical properties. تبدیل انرژی. 2019; 6 (1) :17-21
URL: http://jeed.iaud.ac.ir/article-1-265-en.html

Volume 6, Issue 1 (5-2019) Back to browse issues page
مجله علمی تخصصی مهندسی مکانیک تبدیل انرژی Journal of Energy Conversion
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