Effect of B_(2)O_(3) enrichment on microstructural inhomogeneity of high strength steel weldments  

作　　者：Joydeep Roy Pritam Das 

机构地区：[1]Department of Mechanical Engineering,National Institute of Technology Agartala,Tripura 799035,India

出　　处：《China Welding》2024年第3期25-32,共8页中国焊接（英文版）

摘　　要：The present work attributes the role of boron on the high strength steel submerged arc weld using an undermatching filler wire.Mild steel filler wire was used for welding in constant machine parameters setting to evaluate the joint strength due to the enrichment of boron.To change the chemical composition of the weld metal,boron trioxide powder was blended with virgin flux in various proportions(2.5%−12.5%),which led to an increase in boron weight percentage in the range of 0−0.0065.The results show that weld metals(WM)optical micrographs depict the various types of ferrites,pearlites and secondary phases like martensite-austenite(M-A).Acicular ferrite content was influenced by the boron trioxide addition.Heat affected zone(HAZ)micrographs were not showing appreciable changes with oxide enrichment.Hardness and toughness of weld metals showed the mixed trend with B_(2)O_(3) enrichment whereas,small reduction in ultimate tensile strength(UTS)and yield strength(YS)was observed.

关 键 词：high strength steel B_(2)O_(3) flux microstructure HARDNESS TOUGHNESS ultimate tensile strength 

分 类 号：TG457.11[金属学及工艺—焊接]