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Abstract: Hydrogen diffusion coefficients in weld metal, heat affected zone (HAZ) and base metal of the 16MnR steel weldment are determined by using electrochemical permeation technique. A 3D sequential coupling calculating method on hydrogen diffusion is developed based on the finite element code-ABAQUS. The effects of welding residual stress and microstructure on the hydrogen diffusion are taken into account. The hydrogen concentration versus time is obtained. The hydrogen concentration accumulation and welding residual stress is much larger in weld metal and HAZ, which will increase the cracking probability related to the hydrogen under the stress.
Key words: Weldment Hydrogen diffusion
Residual stress Different microstructure
Finite element analysis
CLC No: TG457
国家留学回国人员科技活动择优(200209)和江苏省“六大人才高峰”(06-D-035)资助项目. Received 20060718, received in revised form 20070412
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