本文選題：藥芯焊絲　切入點：成分設計　出處：《焊接學報》2017年04期

【摘要】：針對軌道交通裝備用屈服強度為450 MPa級低合金高強鋼研制了一種焊接工藝性能優(yōu)良、具有高強韌性、良好抗疲勞性能的藥芯焊絲,并對研制的藥芯焊絲熔敷金屬拉伸、低溫沖擊韌性和疲勞強度等力學性能及組織進行了分析.結果表明,研制的藥芯焊絲成分設計合理,焊縫組織以針狀鐵素體和粒狀貝氏體為主,晶粒細小,有效提高了焊縫的強韌性,使焊縫具有優(yōu)良的低溫韌性和疲勞性能.藥芯焊絲熔敷金屬的抗拉強度達到620 MPa,-40℃低溫韌性夏比沖擊吸收功為96 J,指定壽命為2×10~6次循環(huán)下的疲勞極限為354 MPa,分別是設計目標值的1.1倍、1.6倍和2.2倍,能夠滿足軌道交通裝備用屈服強度為450 MPa級低合金高強鋼的焊接需求.
[Abstract]:A flux-cored wire with high yield strength of 450 MPa low alloy high strength steel for rail transit equipment has been developed with excellent welding process performance, high strength toughness and good fatigue resistance.The mechanical properties and microstructure of low temperature impact toughness and fatigue strength were analyzed.The results show that the composition design of the flux-cored wire is reasonable, the microstructure of the weld is mainly acicular ferrite and granular bainite, the grain is fine, the strength and toughness of the weld are improved effectively, and the weld has excellent low temperature toughness and fatigue properties.The tensile strength of flux-cored wire cladding metal reaches 620 MPA ~ 40 鈩，

本文編號：1720455