摘要
系统研究QBe1.9铍青铜和Cu-0.5Cr-0.2Zr铬锆铜热处理前后及TIG焊后的力学性能、导电性、显微组织。结果表明,经固溶时效处理后,QBe1.9合金析出具有体心立方的硬质γ相,抗拉强度由560.57 MPa提高到761.95 MPa,硬度由246 HV0.02提高到362 HV0.02,电导率由27.43%IACS提高到50.19%IACS。铬锆铜析出具有体心立方的Cr原子及锆的金属间化合物,抗拉强度由290.01 MPa提高到411.17 MPa,硬度由81 HV0.02提高到116 HV0.02,电导率由32.75%IACS提高到58.31%IACS。两种铜合金热处理后分别进行TIG焊,焊缝硬度及焊接接头强度均较母材低,热影响区在距焊缝中心1 mm左右,均在焊缝处断裂,为准解理断裂。
Mechanical properties, conductivity and microstructure of QBel. 9 and Cu-0.5 Cr-0. 2Zr alloys before and after heat treatment and TIG welded were systematically investigated. The results show that after solution and aging, QBel. 9 alloy precipitates hard phase γ with body-centered cubic, its tensile strength increases from 560.57 MPa to 761.95 MPa, hardness increases from 246 HV0.02 to 362 HV0.02, and conductivity increases from 27.43% IACS to 50.19% IACS. Cu-O. 5Cr-0. 2Zr alloy precipitates Cr with body-centered cubic and Zr intermetallic compound, its tensile strength increases from 290. 01 MPa to 411.17 MPa, hardness increases from 81 HV0.02 to 116 HV0.02, and conductivity increases from 32.75% IACS to 58.31% IACS. After TIG welding, weld hardness and welded joint strength of the two alloys after heat treatment are lower than the matrix, the width of HAZ is about 1 mm, fracture oecurrs in the weld seam and with quasi-cleavage characteristic.
出处
《金属热处理》
CAS
CSCD
北大核心
2012年第12期20-24,共5页
Heat Treatment of Metals
关键词
铍青铜
铬锆铜
显微组织
焊接性能
beryllium bronze
chromium zirconium copper
microstructure
weld properties
