Research on The Formation Mechanism and Control Measures of Watermark Defects on The Surface of Cu-Ni-Sn Alloy
Watermark defect is a surface technical problem often encountered in Cu-Ni-Sn alloy during heat treatment and hot rolling production,which seriously affects product quality.This paper analyzes the watermark defects on the surface of Cu-Ni-Sn alloy after heat treatment and hot rolling using optical microscopy,surface roughness analyzer,scanning electron microscopy,and other equipment.The results showed that the roughness curve at the watermark defect showed abnormalities,with many irregularly shaped protrusions,pecking points,and microcracks distributed,and the hot rolled texture was disordered.This is due to the insufficient lubrication performance of the quenching oil used for heat treatment,which leads to local lubrication failure in the deformation zone.The rolling roller directly contacts the newly formed surface of the Cu-Ni-Sn alloy,causing adhesion.The residual concentrated emulsion is adsorbed in the defect and is not easy to be blown clean.After annealing and carbonization,it visually appears as a parallel rolling white stripe watermark defect.By developing a new type of emulsion with better corrosion inhibition and lubrication effects,the problem of watermark defects on the surface of Cu-Ni-Sn alloy during heat treatment and hot rolling can be solved.
国家科技期刊平台
NSTL
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