Sources of Variability and Lower Values in Toughness Measurements of Weld Metals |
| |
Authors: | R Cao J J Yuan Z G Xiao J Y Ma G J Mao X B Zhang J H Chen |
| |
Affiliation: | 1.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Department of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou,People’s Republic of China;2.Hobart Brothers Company, An ITW Welding Company,Troy,USA |
| |
Abstract: | In this paper, the sources of variability and lower values in toughness measurements of a high-strength low alloy weld metal are investigated by detailed observations of fracture surfaces and the microstructures at crack initiation. The results reveal that the variability of the notch Charpy toughness is related to the location of the cleavage initiation origins. The three factors jointly contribute to give rise to variability and lower value of toughness. That is, (1) the location that the notch is sampled at deposited weld metal or reheated weld metal, (2) the location that a large grain region is appeared on the path ahead of the notch root, (3) the distributed location of the defect or the brittle second-phase particle. When three factors were simultaneously satisfied, the lower value of the Charpy toughness is appeared. The notch is sampled at the largest grain region at deposited weld metal, and the defect or the brittle second-phase particle is close to the notch root and sampled by its high stress field, the lowest Charpy toughness is obtained. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|