Influence of Ti on Weld Microstructure and Mechanical Properties in Large Heat Input Welding of High Strength Low Alloy Steels

被引：0

作者：

A-rong

Lin ZHAO

Chuan PAN

Zhi-ling TIAN

机构：

[1] ChinaIronandSteelResearchInstituteGroup

来源：

JournalofIronandSteelResearch(International) | 2015年 / 22卷 / 05期

关键词：

large heat input welding; Ti; microstructure; acicular ferrite; inclusion; high strength low alloy steel;

D O I：

暂无

中图分类号：

TG457.11 [钢];

学科分类号：

080201 ; 080503 ;

摘要：

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 TiMn-Al-O and finally to Ti-Al-O as Ti content increases from 0up to 0.064%.As for adding 0.028%-0.038% Ti,high weld toughness could be attained since most inclusions less than 2μm 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%.

引用

页码：431 / 437

页数：7

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