Effect of tempering on microstructure and mechanical properties of E101T1-K3C deposite metal
EH620 steel was welded using E101T1-K3C low-alloy high-strength steel flux cored wire.The joint was tempered at both 460 ℃ and 580 ℃ for 1 h.Metallographic microscope,material testing machine,impact testing machine,and scanning electron microscope were applied to analyze and measure the microstructure and mechanical properties of the sample.The results shows that the microstructure of the weld metal was predomina-ted by lamellar ferrite,bainite,and second phase particles.The microstructure of the fusion zone consisted of lamellar ferrite,martensite,and second phase particles.After tempering at 580 ℃,the weld and fusion zone was composed of ferrite,tempered sorbite,and second phase particles.And the yield strength of the weld metal decreased from 725 to 589 MPa,while the impact energy KV2 at-40℃increased from 71 to 114 J.Addition-ally,the Vickers hardness value distribution became more uniform throughout the weld seam and HAZ,and the welding joint exhibited admirable mechanical properties.
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