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铝合金退火有哪些影响因素大家知道吗?

来源:  发布时间:2020-05-06 10:20:37  

  1.高温均匀退火的原因
  1. Reasons for high temperature uniform annealing
  铝合金板材能经受高温均匀退火与它的表面有较强而致密的氧化膜有关。在非平衡合金锭以上固相温度加热,晶间和低熔点树突细胞网络组件之间融化,会发生如果没有紧凑的表面氧化膜保护,周围大气中氧气和其他气体沿晶间融化渗透,晶界氧化,晶间组合将被摧毁,导致铸锭废(燃烧)。然而,由于铝合金锭表面有一层致密的氧化膜保护,除了极薄的表面层外,锭内不会发生晶间氧化。此时,在长期高温的作用下,未氧化的非平衡易熔材料将逐渐溶入铝基a的固溶体中,使组织均匀化过程相对完成。铝合金锭中往往含有一定量的氢,在高温均质化时,氢会偏于熔融液相形成气孔,这些气孔可能在热变形时被焊接,但对产品性能的影响应仔细研究。

铝卷生产厂家
  It is related to the strong and compact oxide film on the surface of aluminum alloy sheet that can withstand high temperature uniform annealing. If the solid phase temperature is heated above the non-equilibrium alloy ingot, the melting between the intergranular and low melting point dendritic cell network components will occur. If there is no compact surface oxidation film protection, oxygen and other gases in the surrounding atmosphere will melt and permeate along the intergranular, the grain boundary will be oxidized, and the intergranular combination will be destroyed, leading to the ingot waste (combustion). However, due to the protection of a dense oxide film on the surface of aluminum alloy ingot, intergranular oxidation will not occur in the ingot except for the extremely thin surface layer. At this time, under the action of long-term high temperature, the non-equilibrium and non oxidized fusible materials will gradually dissolve into the solid solution of aluminum matrix A, so that the process of homogenization of the structure is relatively completed. Aluminum alloy ingots often contain a certain amount of hydrogen. During high temperature homogenization, hydrogen will form pores in the molten phase, which may be welded during thermal deformation, but the effect on product performance should be studied carefully.
  2.高温非均匀退火的求解
  2. Solution of high temperature non-uniform annealing
  大多数铝合金板不能在上述高温下退火。为了使均质过程更加迅速和彻底,避免过烧,可以在低于非平衡固体线的温度下加热。然后,到一个更高的温度,完成均匀退火过程。这种分步加热工艺已在超高强度铝合金中得到应用。
  Most aluminum alloy plates cannot be annealed at the above high temperature. In order to make the homogenization process more rapid and thorough and avoid overburning, it can be heated at a temperature lower than the non-equilibrium solid line. Then, to a higher temperature, complete the uniform annealing process. This step heating process has been applied in ultra-high strength aluminum alloy.
  合理的退火温度范围通常是通过实验确定的,特别是对于多组分合金。根据状态图和DSC分析,可以大致选择一个温度范围。在此范围内,可以观察到不同温度(同一时间)退火后的组织(是否过烧)和性能变化,确定合理的温度范围。
  The reasonable annealing temperature range is usually determined by experiments, especially for multicomponent alloys. According to the state diagram and DSC analysis, a temperature range can be roughly selected. In this range, the change of microstructure (overburning or not) and properties after annealing at different temperatures (at the same time) can be observed, and a reasonable temperature range can be determined.
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