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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。
UNS C95700 manganese aluminate bronze plates were brazed with different metallic solders to study the microstructure and mechanical properties of the weldments. The results show that the main microstructure of weldment is α, β and κ with different morphologies. The addition of manganese reduced the alpha phase content in the microstructure of the weldment from 80% (Mn-free weldment) to 57% (12.5% Mn weldment). The appearance of the κ phase in a high-nickel weldment is lamellar and the κ-phase morphology becomes spherical in a high-manganese weldment. Weldments made with high-manganese solder have higher tensile strength and flexural strength than those obtained with high-nickel solder. When ERCuAlN-A2-based, high-manganese solder (ERCuMnNiAl) is used for fillet welding, the mechanical properties of the weldment are the best. The tensile strength of this weldment is 39% higher than the tensile strength of the base metal, and cracking did not occur after the bending test.