Modares Mechanical Engineering

Modares Mechanical Engineering

Experimental Determination of the Tempering Effect On Tensile Strength, Impact Strength, Fatigue, Residual Stress of Girth Welding on Gas Transmission Pipelines

Document Type : Original Research

Author
M. Sabokrouh
Engineering Faculty, Mahallat Institute of Higher Education, Mahallat, Iran
Abstract
The effects of tempering heat treatment on girth weld containing titanium oxide and titanium carbide nanoparticles (X-65 grade of the gas pipeline) were evaluated. The Charpy results show that it has been respectively increased by 26% and 15% in the tempered sample containing titanium oxide and titanium carbide nanoparticles compared to the no heat treatment sample (containing titanium carbide and titanium carbide nanoparticles). Also, the ultimate strength tempered sample containing titanium oxide nanoparticles and titanium carbide nanoparticles compared to the no heat treatment sample (containing titanium oxide and titanium carbide nanoparticles) has been respectively decreased by 6% and 4%. The results show that the fatigue life in both tempered nano-alloy samples has been increased. The fatigue life in the tempered sample of titanium carbide nanoparticles has increased more than the fatigue life in titanium oxide nanoparticles. The fatigue test results show that in the tempered sample containing titanium carbide nanoparticles compared to the tempered sample containing titanium oxide nanoparticles, fatigue life (150-N force) has been increased by 30%. In this loading, the fatigue life (tempered sample containing titanium carbide nanoparticles compared to the no heat treatment sample) has been increased by 19%. The hole drilling strain gage results show that in the tempered sample containing titanium oxide nanoparticles and titanium carbide nanoparticles, hoop residual stresses have been respectively decreased by 48% and 45% compared to the no heat treatment sample (containing titanium oxide and titanium carbide nanoparticles).
Keywords
Nano-Welding
Tempering
Fatigue
Residual Stress
Impact Strength

Subjects

Lee HK, Jo Jhung M, Kim MC, Lee BS. Effects of tempering and PWHT on microstructures and mechanical properties of SA508 GR.4N steel. Nuclear Engineering and Technology. 2014;46(3):413-422. [Link] [DOI:10.5516/NET.07.2013.088]
Nathan SR, Balasubramanian V, Malarvizhi S, Rao AG. Effect of welding processes on mechanical and microstructural characteristics of high strength low alloy naval grade steel joints. Defence Technology. 2015;11(3):308-317. [Link] [DOI:10.1016/j.dt.2015.06.001]
Srinivasan L, Jakka SJ, Sathiya P. Microstructure and mechanical properties of Gas tungsten arc Welded High Strength Low Alloy (15CDV6) steel joints. MaterialsToday: Proceedings. 2017;4(8):8874-8882. [Link] [DOI:10.1016/j.matpr.2017.07.238]
Beidokhti B, Koukabi AH, Dolati A. Effect of titanium addition on the microstructure and inclusion formation in submerged arc welded high strength alloy pipeline steel. Journal of Materials Processing Technology. 2009;209(8):4027-4035. [Link] [DOI:10.1016/j.jmatprotec.2008.09.021]
Chabok A, Dehghani K, Ahmadi Jazani M. Comparing the fatigue and corrosion behavior of nanograin and coarse-grain IF steels. Acta Metallurgica Sinica. 2014;28:295-301. [Link] [DOI:10.1007/s40195-014-0196-2]
Muszka K, Majta J, Damian Hodgson P. Modeling of the mechanical behavior of nanostructured HSLA steels. The Iron Steel Institue Japan. 2007;47(8):1221-1227. [Link] [DOI:10.2355/isijinternational.47.1221]
Dhua SK, Mukerjee D, Sarma DS. Influence of tempering on the microstructure and mechanical properties of HSLA-100 steel plates. Metallurgical and Materials Transactions A. 2001;32:2259-2270. [Link] [DOI:10.1007/s11661-001-0201-z]
Sabokrouh M, Hashemi SH, Farahani MR. Experimental study of the weld microstructure properties in assembling of natural gas transmission pipelines. Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture. 2017;231(6):1039-1047. [Link] [DOI:10.1177/0954405415579581]
Sabokrouh M, Farahani MR. Experimental study of the residual stresses in girth weld of natural gas transmission pipeline. Journal of Applied and Computational Mechanics. 2019;5(2):199-206. [Link]
Sabokrouh M, Farahani MR. Simulation of the residual stresses distribution in girth weld of gas transmission pipeline. Modares Mechanical Engineering. 2019;19(1):223-228. [Persian] [Link]
Sabokrouh M, Farahani MR. Mathematical modeling of residual stress distribution in girth welding of high strength low alloy steel gas pipelines. Modares Mechanical Engineering. 2018;18(7):226-232. [Persian] [Link]
Sabokrouh M, khoshsima B. Experimental determination of the effect of titanium nanoalloy on mechanical properties of girth welding on Iranian natural gas transmission pipelines. Journal of Solid and Fluid Mechanics. 2018;8(3):213-219. [Persian] [Link]
Modares Mechanical Engineering
Volume 20, Issue 4
April 2020
Pages 1033-1039