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利用光学显微镜、扫描电镜、X射线衍射仪及电化学腐蚀试验、切削试验等,观察并研究了65CuZn3Si合金和65CuZn1Si合金热处理前后微观组织、腐蚀性能和切削性能的变化。结果表明:在水冷条件下,随退火温度的升高,65CuZn3Si合金γ相晶粒尺寸逐渐变小,且有富含Si、P的纳米级颗粒状质点析出;当退火温度达到800℃时,γ相尺寸仅为1~5μm,合金的切削性能得到明显的改善;同时,其耐腐蚀性能也有所提高。而含Si量较低的65CuZn1Si合金,热处理对其性能的改善并不明显。
The changes of microstructure, corrosion and cutting performance of 65CuZn3Si alloy and 65CuZn1Si alloy before and after heat treatment were observed and studied by using optical microscope, scanning electron microscope, X-ray diffraction, electrochemical corrosion test and cutting test. The results show that the grain size of γ-phase of 65CuZn3Si alloy decreases gradually with the increase of annealing temperature under the condition of water cooling, and nano-granular particles rich in Si and P precipitate out. When the annealing temperature reaches 800 ℃, γ Phase size of only 1 ~ 5μm, the cutting performance of the alloy has been significantly improved; the same time, its corrosion resistance has also been improved. The 65CuZn1Si alloy with lower Si content, heat treatment to improve its performance is not obvious.