管线钢用自保护药芯焊丝低温冲击韧性
发布时间：2018-10-05 19:08
【摘要】：以BaF_2-Fe_2O_3-Al-Mg渣系自保护药芯焊丝为研究对象,通过冲击韧性试验,研究了残余Al、N及O质量分数对焊丝熔敷金属低温冲击韧性的影响。借助金相显微镜和扫描电子显微镜等仪器,对熔敷金属及其夹杂物显微组织进行了观察分析。分析结果表明:焊丝熔敷金属的低温冲击韧性随着残余Al质量分数的增加而降低。残余Al质量分数较低时,熔敷金属夹杂物以圆形的Al_2O_3为主,焊缝心部为细小的粒状贝氏体组织,低温冲击韧性较高。残余Al质量分数较高时,熔敷金属夹杂物以不规则多边形AlN为主,焊缝心部为粒状贝氏体和少量块状铁素体,低温冲击韧性较低。同时,合理控制焊丝中微量元素质量分数可有效提高熔敷金属的低温冲击韧性。
[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.
【作者单位】： 洛阳双瑞特种合金材料有限公司;
【基金】：国家自然科学基金项目(U1204520) 河南省科技创新杰出人才计划基金项目(144200510001) 工信部联装基金项目([2013]41号)
【分类号】：TG422.3
[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.
【作者单位】： 洛阳双瑞特种合金材料有限公司;
【基金】：国家自然科学基金项目(U1204520) 河南省科技创新杰出人才计划基金项目(144200510001) 工信部联装基金项目([2013]41号)
【分类号】：TG422.3
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