Thermal Simulation Study of CGHAZ Austenite Grain Growth Behavior of X80 Pipeline Steel

Xiang Dong Huo; Feng Dong; Lie Jun Li

doi:10.4028/www.scientific.net/AMR.941-944.146

Paper Titles

Bake Hardening Properties of Ultra-Rapid Annealed Ultra-Low Carbon Bake Hardening Steel
p.127

Study on Internal Quality of Billets for 20CrMnTiH Steel
p.132

Study on Microstructure and Properties of X80 Pipeline Steel
p.138

Study on Microstructure and Property in Heat-Affected Zone of X80 Pipeline Steel
p.142

Thermal Simulation Study of CGHAZ Austenite Grain Growth Behavior of X80 Pipeline Steel
p.146

Research on Mechanics Performance of TP304H Austenitic Stainless Steel in the Process of Aging at High Temperature
p.150

Experimental Study on Hydrogen Selective-Reduction of Niobium Containing Iron Ore Powder
p.157

Research on the Corrosive Factors of Q235 Steel in Simulate Ammonium Sulfate Solution of Ammonia Desulphurization
p.165

Microstructure and Mechanical Property Analyses of Brazing Titanium and Low Carbon Steel Using Silver-Based Brazing Alloy
p.169

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Thermal Simulation Study of CGHAZ Austenite Grain Growth Behavior of X80 Pipeline Steel

Abstract:

The effect of peak temperature on austenite grain size was investigated by using thermal simulation and OM, TEM analysis. Grains grow slowly below 1250°C, and dramatically grow up as the temperature exceeds 1350°C. The primary precipitates in X80 pipeline steel are TiN and NbC, TiN particles cannot absolutely dissolve in steel during holding for 2s at 1300°C.Although TiN particles exist in steel, they cannot hinder grain growth of CGHAZ during welding process. The phenomenon can be explained by Ostwald Ripening mechanism.