Hydrogen concentration behavior of y-grooved weld joint based on a coupled analysis of heat transfer - thermal stress - hydrogen diffusion

Go Ozeki1*, A. Toshimitsu Yokobori1, Toshihito Ohmi2, Tadashi Kasuya3, Nobuyuki Ishikawa4, Satoshi Minamoto5, Manabu Enoki

1Strategic Innovation and Research Center, Teikyo University, Tokyo, 173-8605, Japan

2Department of Mechanical Engineering, Shonan Institute of Technology, Kanagawa, 251-8511, Japan

3Graduate School of Engineering, The University of Tokyo, Tokyo, 113-8656, Japan

4Steel Research Laboratory, JFE Steel Corporation, Kanagawa, 210-8555, Japan

5Research and Services Division of Materials Data and Integrated System, National Institute for Materials Science, Ibaraki, 305-0047, Japan

Adv. Mater. Lett., 2018, 9 (10), pp 677-683

DOI: 10.5185/amlett.2018.2160

Publication Date (Web): Jul 18, 2018

E-mail: go.ozeki@med.teikyo-u.ac.jp

Abstract


It is important to predict the stress driven hydrogen induced cracking at the weld joint on the basis of computational mechanics from the view point of engineering problem. In this study, On the basis of proposed numerical analysis, behaviors of hydrogen diffusion and concentration during cooling process of y-grooved weld joint were analyzed and the mechanism of hydrogen induced cracking was investigated. One of authors has been proposed a multiplication method which magnifies the hydrogen driving term in the diffusion equation to realize correctly hydrogen concentration behaviors. In this study, the behaviors of hydrogen diffusion and concentration for the model of y-grooved weld joint was analyzed by combining a multiplication method with the coupled analyses of heat transfer – thermal stress – hydrogen diffusion. As a result, hydrogen was found to diffuse from weld metal to base metal through HAZ (Heat Affected Zone), and concentrate at the position of blunt angle side of weld groove bottom. It was found that hydrogen concentrates at the position of the local maximum value of hydrostatic stress gradient. This analytical result was found to well predict the actual hydrogen induced cracking of the y-grooved weld joint. Using this method of analysis, prediction of hydrogen induced cracking becomes possible. 

Keywords

Hydrogen diffusion, heat transfer, thermal stress, coupled analysis, y-grooved weld joint.

Current Issue
The Journey of a Decade to Advancing Materials
Are the Electrospun Polymers Polymeric Fibers?
Mechanical and Thermal Properties of Composite Material and Insulation for a Single Walled Tank for Cryogenic Liquids
Prediction of Long-Term Behavior for Dynamically Loaded TPU
Investigation of Doped Titanium Dioxide in Anatase Phase. Study ab initio using Density Functional Theory
Comparison between Single Al2O3 or HfO2 Single Dielectric Layers and their Nanolaminated Systems
Preparation of Stable and Optimized Antibody-gold Nanoparticle Conjugates for Point of Care Test Immunoassays
Resonance-Based Temperature Sensors using a Wafer Level Vacuum Packaged SOI MEMS Process
Integrated System Based on the Hall Sensors Incorporating Compensation of the Distortions
The Efficacy of Cinnamomum Tamala as a Potential Antimicrobial Substance against the Multi-Drug Resistant Enterococcus Faecalis from Clinical Isolates
The Effect of Complexing Reagent on Structural, Electrical and Optical Properties of CuS Thin Film
Laser Cladding of Fluorapatite Nanopowders on Ti6Al4V
Preparation and Evaluation of Sulfonate Polyethylene Glycol Borate Ester as a Modifier of Functional Properties of Complex Petroleum Lithium Grease

Upcoming Congress

Knowledge Experience at Sea TM