使用不同金属焊料对UNS C95700锰铝青铜板进行补焊,研究焊件的显微组织和力学性能.结果表明,焊件主要显微组织为具有不同形貌的α,β和κ相.锰的加入使焊件显微组织中α相的含量由80%(无Mn焊件)降低到57%(12.5%Mn焊件).在高镍焊件中κ相的形貌为层状,而在高锰焊件中κ相形貌变为球状.相对于使用高镍焊料获得的焊件,采用高锰焊料获得的焊件具有较高的抗拉强度和弯曲强度.当以非合金焊料ERCuAl-A2为衬底、高锰焊料(ERCuMnNiAl)为填充焊道进行补焊时,焊件的力学性能最佳.此焊件的抗拉强度比基体金属的抗拉强度提高了39%,且弯曲试验后仍未发生开裂现象.
The repair welding of UNS C95700 manganese?aluminum bronze plates was done using different filler metals. The microstructure and mechanical properties of welds were studied. The main microstructural constituents wereα,β andκ phases with different morphologies. The addition of manganese decreased the percentage ofα phase in the microstructure of weldments from 80% (Mn-free weld) to 57% (12.5% Mn weld, mass fraction). The morphology ofκ phase was lamellar in high nickel specimens and it was changed to a globular morphology for high manganese welds. Although the application of high manganese filler metal yielded the higher tensile and bending strengths of weldment compared with the weld using high nickel filler material, the optimum mechanical properties of repair welds were obtained using a non-alloy filler material (ERCuAl-A2) for the underlay and high manganese filler metal (ERCuMnNiAl) for filling passes. This weld presented an increase of 39% in tensile strength compared with the base metal, and no cracking was observed after bending test.
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