热处理工艺对Ti2AlNb惯性摩擦焊接头组织及性能的影响

doi:10.3901/JME.2020.08.077

摘要/Abstract

摘要： 针对Ti₂AlNb合金惯性摩擦焊接接头开展了热处理工艺试验研究，分析了不同热处理工艺对焊接接头组织及力学性能的影响。研究表明，固溶态母材由α₂、B2和O相构成，α₂相呈球状或块状分布于B2相晶界上，O相呈棒状平行或交叉分布于B2相晶粒内部；固溶+单时效态合金母材由B2+O两相组成。焊态下的接头焊缝区及热力影响区基本为B2相组织，双时效处理后大部分B2相转变成晶界网状O相+晶内针状及块状O相组织，单时效处理的接头焊缝区及热力影响区晶界基本无O相组织存在，B2相晶内转变为细密层片状B2+O相共析组织。三种热处理状态的接头各区域显微硬度分布基本一致，焊后双时效提高了O相组织的析出而起到强化作用并提高了接头的显微硬度。焊前为固溶态+焊后双时效处理的接头室温抗拉强度最高且为1 193 MPa；焊后双时效处理的接头室温拉伸断口以准解理断裂为主，焊后单时效处理的接头室温拉伸断口以解理断裂为主，且解理小平面尺寸较大，抗拉强度稍低。焊前为固溶态+焊后双时效处理的接头在650℃高温下的抗拉强度依然最高且为986 MPa，断口上能够观察到较浅的韧窝，为沿晶的韧性断裂；焊前为固溶态+时效处理的接头断口形貌基本相同，接头断裂形式以解理断裂为主，并含有少量的准解理断口。

关键词: Ti₂AlNb, 惯性摩擦焊, 组织, 力学性能

Abstract: Inertia friction welded Ti₂AlNb alloy joints are subjected to heat treatment. The effects of different heat treatment processes on the microstructure and mechanical properties of welded joints are analyzed. The results indicate that base metal shows a typical microstructure comprised of α₂, B2 and O three phases. Base metal of aging treatment shows a typical microstructure comprised of B2+O phases. The microstructure of weld zone(WZ) and thermo-mechanically affected zone(TMAZ) of welded joints is main B2 phase. After double aging treatment, most B2 phase of WZ and TMAZ has transformed to network O phase in grain boundary and the needle with massive O phase within the grain. After aging treatment, O phase is not found in the grain boundary of WZ and TMAZ, and B2 phase transform into close and lamellar eutectoid structure of B2+O phase. The microhardness distribution of the joints in the three heat treatment states is basically the same in all areas. Double aging after welding improves the precipitation of O phase and forms an precipitation strengthening, which improve the microhardness of joints. The tensile strength of welded joint of solid solution before welding and double aging treatment after welding is the highest and is 1 193 MPa at room temperature. Tensile fracture of double aging after welding is mainly quasi cleavage fracture, that the room temperature tensile fracture of the joints of single aging after welding is mainly cleavage fracture, which the size of cleavage plane is relatively large. The tensile strength of joints of solid solution before welding and double aging treatment after welding is still the highest and is 986 MPa at 650℃ high temperature, and shallow dimples can be observed on the fracture that it is ductile fracture along grain boundary. However, the fracture morphology of joints of solid solution and aging treatment before welding is basically the same. The fracture form of the joints is mainly cleavage fracture and contains a small amount of quasi cleavage fracture.

Key words: Ti₂AlNb, inertia friction welded, microstructure, mechanical property

中图分类号:

TG456

周军, 梁武, 乌彦全, 张春波. 热处理工艺对Ti₂AlNb惯性摩擦焊接头组织及性能的影响[J]. 机械工程学报, 2020, 56(8): 77-84.

ZHOU Jun, LIANG Wu, WU Yanquan, ZHANG Chunbo. Effect of Heat Treatment on Microstructure and Properties of Inertial Friction Welded Ti₂AlNb Joint[J]. Journal of Mechanical Engineering, 2020, 56(8): 77-84.

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热处理工艺对Ti₂AlNb惯性摩擦焊接头组织及性能的影响

Effect of Heat Treatment on Microstructure and Properties of Inertial Friction Welded Ti₂AlNb Joint

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