【摘要】 利用金相显微镜、冲击试验等研究了Nb、Ti微合金元素对连铸10MnNiCr钢埋弧焊焊接接头组织与韧性的影响。结果表明,Nb V Ti钢的焊缝和焊接热影响区比Nb V钢的具有更高的冲击韧性。其中Nb元素易促进侧板条铁素体形成,对韧性不利;Ti元素易使焊缝金属产生针状铁素体,并抑制CG HAZ晶粒粗化,对改善埋弧焊接头韧性有显著作用。更多还原

【Abstract】 In this paper the effects of microalloying element Nb and Ti on the microstructure and toughness of submerged melt welding joint of continuous casting 10MnNiCr steel are studied by means of optical microscope and through impact test.The results show that the impact toughness of welding metal and heat affected zone of Nb-V-Ti microalloyed steel is higher than that of Nb-V microalloyed steel. The side plate ferrite promoted easily by element of Nb is disadvantageous of toughness. The element of Ti affects the toughness of submerged melt welding joint abviously for it helps forming acicular ferrite in the welding metal and prohibiting the coarsening of CG-HAZ grain.更多还原