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通过原子光谱、金相显微镜、扫描电镜等手段,观察分析了锡磷青铜合金的成分、组织和性能,研究了合金弯折易断的机理及成因。通过调整冷加工、中间热处理、成品热处理和加工率等关键工艺参数,使合金晶粒度由工艺调整前的35~60μm降低至工艺调整后的10~30μm,合金的横纵向弯折性能得到明显的提高。结果表明,Cu-5.6Ni-0.15P合金弯折解理的主因为S含量过高,导致S偏聚,Cu、Sn、Zn和S组成的第二相主要分布于沿轧制方向的晶界上。
The composition, microstructure and properties of tin-phosphor bronze alloy were observed and analyzed by means of atomic spectroscopy, metallographic microscope and scanning electron microscope. The mechanism and cause of the fracture of alloy were studied. By adjusting the key process parameters of cold working, intermediate heat treatment, finished heat treatment and processing rate, the grain size of the alloy is reduced from 35 ~ 60μm before the process adjustment to 10 ~ 30μm after the process adjustment. The transverse and longitudinal bending properties of the alloy are obviously improve. The results show that the main reason for the cleavage cleavage of Cu-5.6Ni-0.15P alloy is that the S content is too high, resulting in S segregation. The second phase composed of Cu, Sn, Zn and S are mainly distributed along grain boundaries along the rolling direction on.