(1. 華南理工大學(xué) 國(guó)家金屬材料近凈成形工程技術(shù)研究中心，廣州 510640；
2. 廣東華金合金材料實(shí)業(yè)有限公司，廣州 511356)
摘 要: 通過熔鑄方法，于中頻感應(yīng)爐中制備無鉛磷鈣黃銅鑄錠，利用掃描電鏡、電子能譜儀、電子萬能試驗(yàn)機(jī)及臥式車床等手段，研究磷鈣黃銅合金的顯微組織和力學(xué)、切削及耐脫鋅腐蝕性能，并結(jié)合切屑的形貌觀察，分析金屬間化合物對(duì)切削性能的改善作用。結(jié)果表明：磷、鈣顯著改變了黃銅的組織與性能，使得磷鈣黃銅的組織由α相、β相和分布在晶界上及晶粒內(nèi)的金屬間化合物顆粒組成；無鉛磷鈣黃銅合金的主要成分(質(zhì)量分?jǐn)?shù))為57%~60% Cu、40% Zn、0.7% P、0.5% Ca時(shí)，合金顯示出優(yōu)良的綜合性能，其抗拉強(qiáng)度為362.7 MPa，伸長(zhǎng)率為15.0%，布氏硬度為105.0HB，耐脫鋅腐蝕深度為321.9 µm，切削性能與鉛黃銅HPb59−1相當(dāng)。
關(guān)鍵字: 無鉛；磷鈣黃銅；顯微組織；金屬間化合物；性能
CHEN Wei-ping1, WANG Gui-long2, LI Chen2
（1. National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials,
South China University of Technology, Guangzhou 510640, China;
2. Guangdong Hua Jin Advanced Alloys Industrial Company Limited, Guangzhou 511356, China）
Abstract:The ingots of P-Ca brass were prepared in a medium frequency induction furnace through scientific casting process. The microstructure and mechanical, cutting and dezincification corrosion-resistance properties of P-Ca brass were studied by scanning electron microscopy (SEM), energy dispersive spectrometer(EDS), electron universal test machine and lathe, the effect of the intermetallics on the cutting performance was also studied through the observation of chips. The results show that, P and Ca change the microstructure and properties of brass alloys significantly, making the microstructure of P-Ca brass composed of α, β and intermetallic compounds dispersed on grain boundaries and in grains. The reasonable contents (mass fraction) of main elements are 57%−60% Cu, 40% Zn, 0.7% P and 0.5% Ca. The brass alloy containing this component has good performances as follows: tensile-strength of 362.7 MPa, elongation of 15.0%, Brinell hardness of 105.0HB, dezincification depth of 321.9 µm, and the cutting property is as well as that of HPb59−1.
Key words: lead-free; P-Ca brass; microstructure; intermetallics; property
