Abstract
Oxide metallurgy technology plays an important role in inclusion control and is also applied to improve the weldability of high strength steel. Based on the requirements of the weldability in high strength steel, the influencing factors of weld heat affected zone (HAZ) as well as the development and application status of oxide metallurgy technology are summarized in this review. Moreover, the advantages and difficulties in the application of rare earth (RE) oxide metallurgy technology are analyzed, combined with the performance mechanism of RE and its formation characteristics of fine and high melting point RE inclusions with distribution dispersed in liquid steel. With the weldability diversities of different high strength steels, the research status of weldability of high strength steel with high carbon equivalent and the effects of RE on the microstructure and properties of HAZ are discussed, and some suggestions about further research in the future are proposed.
Highlights
High strength low alloy (HSLA) steel, a weldable low carbon engineering structure steel, is obtained by adding a small amount of Mn, Si, Nb, V, Ti, Al and other alloy elements into ordinary carbon steel and subjecting it to a heat treatment process
The results showed that when t8/5 was 7.5Tsh,ethienflcouaernsceinggrafiancztoornseowf ats8/p5raimndariitlsy rmelaarttieonnssihteiplawthit.hGlBoFw, PtFem, apnedrastoumree igmrapnauctlar bationuitgehwneesrseoffoHrmAeZdawreitshhot8w/5nchinanFgigiunrgef4r.oWmh2e0nsa,ffteoc4ti0ngs,thtoe 1m0i0crso,satrnudcttuhree foefrHritAeZs,izt8e/5increisasdeidrescitglynirfeilcaatnedtlyto. heat input, plate thickness, thermal conductivity, specific heat, steel density, and initial temperature, and indirectly related to welding methods, preheating, and heat treatment after welding
The results proved that the coarsening of austenite grain and the formation of upper bainite and M-A structure in heat affected zone (HAZ) of high strength steel with high carbon equivalent are the important factors affecting weldability
Summary
High strength low alloy (HSLA) steel, a weldable low carbon engineering structure steel, is obtained by adding a small amount of Mn, Si, Nb, V, Ti, Al and other alloy elements into ordinary carbon steel and subjecting it to a heat treatment process.
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