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鋁合金退火有哪些影響因素大家知道嗎?

來源:http://www.fuzore.com  發布時間:2020-05-06 10:20:37  

  1.高溫均勻退火的原因
  1. Reasons for high temperature uniform annealing
  鋁合金板材能經受高溫均勻退火與它的表面有較強而致密的氧化膜有關。在非平衡合金錠以上固相溫度加熱,晶間和低熔點樹突細胞網絡組件之間融化,會發生如果沒有緊湊的表面氧化膜保護,周圍大氣中氧氣和其他氣體沿晶間融化滲透,晶界氧化,晶間組合將被摧毀,導致鑄錠廢(燃燒)。然而,由于鋁合金錠表面有一層致密的氧化膜保護,除了極薄的表面層外,錠內不會發生晶間氧化。此時,在長期高溫的作用下,未氧化的非平衡易熔材料將逐漸溶入鋁基a的固溶體中,使組織均勻化過程相對完成。鋁合金錠中往往含有一定量的氫,在高溫均質化時,氫會偏于熔融液相形成氣孔,這些氣孔可能在熱變形時被焊接,但對產品性能的影響應仔細研究。

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  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.高溫非均勻退火的求解
  2. Solution of high temperature non-uniform annealing
  大多數鋁合金板不能在上述高溫下退火。為了使均質過程更加迅速和徹底,避免過燒,可以在低于非平衡固體線的溫度下加熱。然后,到一個更高的溫度,完成均勻退火過程。這種分步加熱工藝已在超高強度鋁合金中得到應用。
  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.
  合理的退火溫度范圍通常是通過實驗確定的,特別是對于多組分合金。根據狀態圖和DSC分析,可以大致選擇一個溫度范圍。在此范圍內,可以觀察到不同溫度(同一時間)退火后的組織(是否過燒)和性能變化,確定合理的溫度范圍。
  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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  The above is the relevant content introduced by the aluminum coil manufacturer for you. To learn more, please visit the website: http://www.jndclyxgs.com

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