(遼寧出入境檢驗(yàn)檢疫局，大連 116001)
摘 要: 采用OPM、SEM及EDS等檢測(cè)手段研究C89320無鉛鉍青銅宏觀、微觀組織特征及力學(xué)性能。結(jié)果表明：該合金以連鑄方式生產(chǎn)，顯微組織由α相、富磷α相、粒狀金屬鉍和Cu3P組成。粒狀金屬鉍和Cu3P只在富磷α相內(nèi)生成，其分布、形態(tài)、數(shù)量和大小與富磷α相成分有關(guān)。鑄態(tài)下，該合金的屈服強(qiáng)度為148 MPa、抗拉強(qiáng)度為300 MPa、斷后伸長(zhǎng)率為36.5%、硬度為70.5 HBW、抗壓強(qiáng)度為146 MPa、夏比沖擊吸收能量為28 J。常溫沖擊斷口呈韌窩狀，具有良好的切削加工性能。
關(guān)鍵字: C89320無鉛鉍青銅；Bi；Cu3P；富磷α相；力學(xué)性能
（Entry-Exit Inspection and Quarantine Bureau of Liaoning Province, Dalian 116001, China）
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.
Key words: C89320 lead-free bismuth tin bronze; Bi; Cu3P; phosphorus-rich α phase; mechanical properties
