Ti60/TC17异种钛合金惯性摩擦焊接头组织性能研究  

Study on the Microstructure and Properties of Ti60/TC17 Dissimilar Titanium Alloy Inertia Friction Welded Joints

作　　者：高山 袁明强 GAO Shan;YUAN Mingqiang(AECC Shenyang Engine Research Institute,Shenyang 110015,China;Harbin Welding Institute Limited Company,Harbin 150028,China;Heilongjiang Provincial Key Laboratory of Advanced Friction Welding Technology and Equipment,Harbin 150028,China)

机构地区：[1]中国航发沈阳发动机研究所,辽宁沈阳110015 [2]中国机械总院哈尔滨焊接研究所有限公司,黑龙江哈尔滨150028 [3]黑龙江省先进摩擦焊接技术与装备重点实验室,黑龙江哈尔滨150028

出　　处：《电焊机》2023年第8期115-121,143,共8页Electric Welding Machine

摘　　要：采用惯性摩擦焊技术焊接Ti60/TC17钛合金,并对焊态/热处理态接头进行组织和性能分析;焊接过程中,有粘流态金属滴落,两侧金属材料熔合较好,且接头焊缝处飞边形貌呈现不规则曲线状,缩短量达4.2 mm,轴向错边小于0.3 mm;焊缝界面两侧区域均发生了动态再结晶,焊缝区显微硬度值较高,越远离焊缝位置显微硬度值越低;焊态下,焊缝处组织为针状α板条和等轴晶粒组成,两侧热机影响区有明显的流线形貌;热处理后,焊缝处针状α板条细化,次生α相增多,再结晶晶界明显,两侧热机影响区流线形貌消失;通过接头拉伸性能测试,焊态/热处理态试样室温拉伸断裂位置均发生在TC17侧,断口形貌呈典型解理断裂,焊态下,平均抗拉强度为978.5 MPa,达母材的92.06%,热处理后,平均抗拉强度为1076.5 MPa,提升98 MPa,超过母材抗拉强度,这说明热处理有利于将组织内的残余应力释放,同时易于析出针状α相,进而提高接头力学性能。This article mainly uses inertial friction welding technology to connect Ti60/TC17 alloy,and analyzes the microstructure and properties of the welded/heat treated joints;During the weld process,there was viscous flow of metal droplets,and the metal materials on both sides fused well.The morphology at the welded joints presented an irregular curve shape,with a reduction of 4.2 mm and an axial misalignment of less than 0.3 mm;Dynamic recrystallization occurred on both sides of the weld interface,resulted in a higher microhardness values in the weld zone,and a lower microhardness value was further away from the weld;In the welded state,the structure of the weld was composed of acicularαslats and equiaxed grains,the heat engine affected zone on both sides had obvious streamline morphology;After heat treatment,the weld was needle shapedαflat noodles refinement,secondaryαthe phase increases,the recrystallization grain boundaries was obvious,and the streamline morphology of the heat affected zone on both sides disappeared;Through joint tensile performance test,the tensile fracture positions of the welded/heat treated specimens at room temperature occurred on the TC17 side,and the fracture morphology showed typical cleavage fracture.In the welded state,the average tensile strength was 978.5 MPa,reaching 92.06%of the base metal.After heat treatment,the average tensile strength was 1076.5 MPa,an increase of 98 MPa,exceeding the tensile strength of the base metal.This indicates that heat treatment was beneficial for releasing residual stress in the organization and was easy to precipitate needle like structuresαPhase,thereby improving the mechanical properties of the welded joint.

关 键 词：钛合金 惯性摩擦焊 异种材料 焊接接头 力学性能 

分 类 号：TG457.19[金属学及工艺—焊接]