【摘要】：以BaF_2-Fe_2O_3-Al-Mg渣系自保護藥芯焊絲為研究對象,通過沖擊韌性試驗,研究了殘余Al、N及O質(zhì)量分數(shù)對焊絲熔敷金屬低溫沖擊韌性的影響。借助金相顯微鏡和掃描電子顯微鏡等儀器,對熔敷金屬及其夾雜物顯微組織進行了觀察分析。分析結(jié)果表明:焊絲熔敷金屬的低溫沖擊韌性隨著殘余Al質(zhì)量分數(shù)的增加而降低。殘余Al質(zhì)量分數(shù)較低時,熔敷金屬夾雜物以圓形的Al_2O_3為主,焊縫心部為細小的粒狀貝氏體組織,低溫沖擊韌性較高。殘余Al質(zhì)量分數(shù)較高時,熔敷金屬夾雜物以不規(guī)則多邊形AlN為主,焊縫心部為粒狀貝氏體和少量塊狀鐵素體,低溫沖擊韌性較低。同時,合理控制焊絲中微量元素質(zhì)量分數(shù)可有效提高熔敷金屬的低溫沖擊韌性。
[Abstract]:The effect of residual Al,N and O mass fraction on low temperature impact toughness of deposited metal was studied by impact toughness test with BaF_2-Fe_2O_3-Al-Mg slag self-shielded flux-cored wire. The microstructure of deposited metal and its inclusions were observed and analyzed by means of metallographic microscope and scanning electron microscope. The results show that the low temperature impact toughness decreases with the increase of residual Al mass fraction. When the mass fraction of residual Al is low, the inclusion of deposited metal is mainly circular Al_2O_3, the center of weld is fine granular bainite structure, and the impact toughness at low temperature is higher. When the mass fraction of residual Al is high, irregular polygonal AlN is dominant in the deposited metal inclusions, granular bainite and a small amount of bulk ferrite are found in the center of the weld, and the impact toughness at low temperature is low. At the same time, the low temperature impact toughness of deposited metal can be effectively improved by controlling the mass fraction of trace elements in welding wire.
【作者單位】： 洛陽雙瑞特種合金材料有限公司;
【基金】：國家自然科學(xué)基金項目(U1204520) 河南省科技創(chuàng)新杰出人才計劃基金項目(144200510001) 工信部聯(lián)裝基金項目([2013]41號)
【分類號】：TG422.3

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