Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1628311 | Journal of Iron and Steel Research, International | 2015 | 7 Pages |
Abstract
The influence of Ti on weld microstructure and mechanical properties in large heat input welding of high strength low alloy steels is investigated. The results indicate that a moderate amount of Ti is still effective for grain refinement even under larger heat input and a large amount of acicular ferrite (AF) is formed in the weld metal when Ti content is within 0.028% - 0.038%. With increasing Ti content, proeutectoid ferrite in the weld metal decreases, whereas bainite and M-A constituent increase. The type of inclusion in the welds varies from Mn-Si-Al-O to Ti-MnAl-O and finally to Ti-Al-O as Ti content increases from 0 up to 0.064%. As for adding 0.028%-0.038% Ti, high weld toughness could be attained since most inclusions less than 2 μm which contain Ti2O3 provide the effective nuclei for acicular ferrite formation. However, the toughness of the weld metals severely reduces when Ti content is over the optimum range of 0.028%-0.038%.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
A-rong A-rong, Lin ZHAO, Chuan PAN, Zhi-ling TIAN,