Effect of Trace Element on Microstructure and Fracture Toughness of Weld Metal

被引：7

作者：

Xu, Ke ^{[1
]}

Fang, Tao ^{[1
]}

Zhao, Longfei ^{[1
]}

Cui, Haichao ^{[1
]}

Lu, Fenggui ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Materials Sci, Shanghai Key Lab Materials Laser Proc, Modification,Engn, Shanghai, Shanghai, Peoples R China

来源：

ACTA METALLURGICA SINICA-ENGLISH LETTERS | 2020年 / 33卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Fracture toughness; Microstructure; Weld metal; Trace element; Crack propagation; MEDIUM-CARBON STEELS; LOW-ALLOY; MECHANICAL-PROPERTIES; ACICULAR FERRITE; INTRAGRANULAR FERRITE; RESIDUAL-STRESS; CRACK; TEMPERATURE; NUCLEATION; EVOLUTION;

D O I：

10.1007/s40195-019-00978-0

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The microstructure and fracture toughness of weld metal under Ti-free and Ti-containing different fluxes were investigated in this study. It was found that the trace element Ti of flux in submerged arc welding produced significant influence on the fracture toughness. The addition of 60 ppm Ti induced the sharp increase in J(0.2) value from 232.78 to 364.08 kJ/m(2). Microstructure characterization revealed that a large number of oxide inclusions prompted the nucleation of acicular ferrites and refined grains, which improved the fracture toughness of Ti-containing weld metal greatly. Moreover, the crack propagation path was more tortuous and bifurcated due to the small amount of carbide precipitations along grain boundaries and blocky martensite-austenite islands for Ti-containing weld metal. Meanwhile, the large-angle grain boundaries caused crack deflection and increased the resistance of crack propagation compared to Ti-free weld metal.

引用

页码：425 / 436

页数：12

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