C89320无铅铋青铜的组织及力学性能

来源期刊:中国有色金属学报2012年第9期

论文作者:董秀文 李岩

文章页码:2546 - 2552

关键词:C89320无铅铋青铜;Bi;Cu3P;富磷α相;力学性能

Key words:C89320 lead-free bismuth tin bronze; Bi; Cu3P; phosphorus-rich α phase; mechanical properties

摘    要:采用OPM、SEM及EDS等检测手段研究C89320无铅铋青铜宏观、微观组织特征及力学性能。结果表明:该合金以连铸方式生产,显微组织由α相、富磷α相、粒状金属铋和Cu3P组成。粒状金属铋和Cu3P只在富磷α相内生成,其分布、形态、数量和大小与富磷α相成分有关。铸态下,该合金的屈服强度为148 MPa、抗拉强度为300 MPa、断后伸长率为36.5%、硬度为70.5 HBW、抗压强度为146 MPa、夏比冲击吸收能量为28 J。常温冲击断口呈韧窝状,具有良好的切削加工性能。

Abstract: The macrostructure, microstructure and mechanical properties of C89320 lead-free bismuth tin bronze were investigated by OPM, SEM and EDS techniques. The results show that when the C89320 is fabricated by continuous casting process, the microstructure mainly contains α phase, phosphorus-rich α phase, particle-like Bi and Cu3P phases. Bi and Cu3P phases are associated with the phosphorus-rich α phase, whose morphology, size and number are related to the composition of the phosphorus-rich α phase. The yield strength, tensile strength, elongation, hardness, compressive strength and impact energy of the as-cast alloy are 148 MPa, 300 MPa, 36.5%, 70.5 HBW, 146 MPa, and 28 J, respectively. The impact fracture at the room temperature is typical dimple fracture pattern and the alloy has excellent cutting machinability.

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