纯镍板材制备工艺研究

Study on Preparation Process of Pure Nickel Sheets

以5 mm厚热轧纯镍板材为原料,制备冷轧板材。研究了成品力学性能随退火温度的变化趋势以及半成品退火温度、冷轧变形量对纯镍板材板形和成品性能的影响。研究发现纯镍板材的性能随着退火温度的变化存在一个陡峭的拐点,大约在580-600℃之间,拐点之前和之后,力学性能变化较小。拐点之前退火温度较低时,强度与冷加工态性能相当。拐点之后退火温度较高时,随着温度的升高,强度缓慢下降,伸长率缓慢升高。合适的成品退火温度应选择在拐点之后的600-700℃。降低半成品退火温度并进行半硬态退火,可提高成品冷轧板材的板形和力学性能。加大单轧程的变形量（约80%）,可提高纯镍板的力学性能。

Taking hot-rolled pure nickel plate with 5mm thickness as raw material, the cold-rolled sheets were prepared. The mechanical properties of the finished products changed with annealing temperatures variation and the effects of intermediate annealing and cold-rolling deformation on the properties and plate shape were studied. The results show that there is a steep inflection point about between 580-600℃ in properties of pure nickel plate changing with annealing temperatures variation. Before and after the inflection point, variation of mechanical properties is smaller. Before the inflection point, and annealing at lower temperature, the strength is approach to that of the cold-working state. Alter the inflection point, and annealing at higher temperature, the strength declines slowly and the elongation rises slowly with the increase of temperature. The appropriate annealing temperature should be chosen at 600-700℃ after the inflection point. Reducing semi-finished product annealing temperature and implementing semi-hard annealing can improve the straightness and mechanical performance of cold-rolled sheets. Increasing the deformation of single rolling process （above 80%） can improve the mechanical properties of pure nickel sheets.