铸态高强韧合成球墨铸铁的试验研究
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摘要
以废钢、原料纯铁和球铁回炉料为主要炉料,采用中频感应电炉熔炼,通过优质增碳剂增碳,获得了适宜成分的原铁水,并利用钟罩法分别进行炉内预处理和球化处理,浇包冲入法进行孕育处理,浇注树脂砂壳型,制备了符合目标成分范围的铸态高强韧合成球铁Y块铸件。微观组织及力学性能测试结果表明,石墨球化效果较好,基体组织细小,铸态抗拉强度和伸长率最大值分别可达到818.1MPa和8.25%。
Taking scrap steel, raw material pure iron and ductile iron foundry return as the main furnace charge, using medium frequency induction furnace to smelt, carburizing by high quality carburizing agent, base molten iron with suitable composition was obtained. Then, the pretreatment in furnace and spheroidizing treatment were carried out using bell jar method. Inoculation treatment was carried out by ladle flushing method, the molten iron was poured in resin sand shell mold,Y block castings in accordance with the target composition range of as-cast synthetic ductile iron were prepared. The results of microstructure and mechanical properties show that the graphite spheroidization is good, the matrix structure is fine, and the maximum tensile strength and elongation of as-cast material reach 818.1 MPa and 8.25% respectively.
Taking scrap steel, raw material pure iron and ductile iron foundry return as the main furnace charge, using medium frequency induction furnace to smelt, carburizing by high quality carburizing agent, base molten iron with suitable composition was obtained. Then, the pretreatment in furnace and spheroidizing treatment were carried out using bell jar method. Inoculation treatment was carried out by ladle flushing method, the molten iron was poured in resin sand shell mold,Y block castings in accordance with the target composition range of as-cast synthetic ductile iron were prepared. The results of microstructure and mechanical properties show that the graphite spheroidization is good, the matrix structure is fine, and the maximum tensile strength and elongation of as-cast material reach 818.1 MPa and 8.25% respectively.
引文
[1]刘鹏,甄立军,王章明,等.球墨铸铁铸件铸造技术研究进展[J].中国铸造装备与技术,2017(4):1-6.
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[3]球墨铸铁件:GB/T1348-2009[S].2009.
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[5]贺焱,郭学锋,林浩,等.高强高韧合成球墨铸铁的组织及力学性能[J].热加工工艺,2010,39(7):27-29.
[6]丁陈民,李永红,刘红.铸态高强度高韧性球墨铸铁的生产技术[J].铸造,2011,60(8):788-790.
[7]陈忠士,邹泽昌,林燕清,等.铸态QT750-5合成球铁凸轮轴的组织及力学性能[J].南昌大学学报(工科版),2015,37(3):292-294.
[8]曾艺成,李克锐,张忠仇.球墨铸铁生产技术的新进展[J].黑龙江冶金,2014,34(5):3-13.
[9]柳建国,曾大新.铸态QT700-10技术初探[J].铸造,2014,63(5):507-509.
[10]TorreUDL,LoizagaA,LacazeJ,etal.Ascast high silicon ductile irons with optimized mechanical properties and remarkable fatigue properties[J].Materials Science&TechnoIogy,2014,30(12):1425-1431.
[11]Graham P S.Principles of manufacturing ductile iron gears[J].AFSTrans,1995,103:437-443.
[12]陈子华.球墨铸铁预处理技术原理及生产应用实例[J].现代铸铁,2010(5):31-36.
[13]Gonzaga R A.Influence of ferrite and pearlite content on mechanical properties of ductile cast irons[J].Materials Science&Engineering A,2013,567(2):1-8.
[2]Hafiz M.Mechanical properties of SG-iron with different matrix structure[J].Journal of Materials Science,200l,36(5):1293-1300.
[3]球墨铸铁件:GB/T1348-2009[S].2009.
[4]曾大新,何汉军,张元好,等.铸态高强度高伸长率球墨铸铁研究进展[J].铸造,2017,66(1):38-43.
[5]贺焱,郭学锋,林浩,等.高强高韧合成球墨铸铁的组织及力学性能[J].热加工工艺,2010,39(7):27-29.
[6]丁陈民,李永红,刘红.铸态高强度高韧性球墨铸铁的生产技术[J].铸造,2011,60(8):788-790.
[7]陈忠士,邹泽昌,林燕清,等.铸态QT750-5合成球铁凸轮轴的组织及力学性能[J].南昌大学学报(工科版),2015,37(3):292-294.
[8]曾艺成,李克锐,张忠仇.球墨铸铁生产技术的新进展[J].黑龙江冶金,2014,34(5):3-13.
[9]柳建国,曾大新.铸态QT700-10技术初探[J].铸造,2014,63(5):507-509.
[10]TorreUDL,LoizagaA,LacazeJ,etal.Ascast high silicon ductile irons with optimized mechanical properties and remarkable fatigue properties[J].Materials Science&TechnoIogy,2014,30(12):1425-1431.
[11]Graham P S.Principles of manufacturing ductile iron gears[J].AFSTrans,1995,103:437-443.
[12]陈子华.球墨铸铁预处理技术原理及生产应用实例[J].现代铸铁,2010(5):31-36.
[13]Gonzaga R A.Influence of ferrite and pearlite content on mechanical properties of ductile cast irons[J].Materials Science&Engineering A,2013,567(2):1-8.