鈦稀土復(fù)合處理對(duì)C-Mn鋼粗晶熱影響區(qū)組織及韌性的影響
[Abstract]:The thermal cycle simulation experiment of welding heat affected zone (HAZ) was carried out by using Gleeble-1500D thermal simulator. The effects of rare earth alone treatment and titanium rare earth composite treatment on the microstructure and impact toughness of coarse grained heat affected zone (HAZ) of C-Mn steel were studied when the welding heat input was 65 kJ / cm ~ (-1). The morphology of inclusion and impact fracture in experimental steel was observed and analyzed by scanning electron microscope. The microstructure of experimental steel after thermal cycling simulation was observed by light microscope. The experimental results show that the microstructure of the samples treated with rare earth alone and titanium rare earth complex is mainly grain boundary ferrite block ferrite acicular ferrite and grain boundary ferrite intracrystalline acicular ferrite respectively. The inclusions in the samples treated by rare earth alone are La_2O_2S manganese-aluminosilicate MnS complex inclusions, and the main inclusions in Ti rare earth treated samples are La_2O_2S TiO_x manganese-aluminosilicate MnS complex inclusions. The composite inclusions in Ti-RE composite treated steel are finer, which is favorable for the formation of fine intragranular ferrite. Titanium rare earth composite treatment greatly improved the low temperature impact toughness of welding heat affected zone of experimental steel, which was better than that of rare earth treatment alone.
【作者單位】: 北京科技大學(xué)冶金與生態(tài)工程學(xué)院;北京科技大學(xué)鋼鐵冶金新技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室;武漢科技大學(xué)耐火材料與冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】:國(guó)家自然科學(xué)基金資助項(xiàng)目(51274269)
【分類號(hào)】:TG457.11
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