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鋁合金在熱處理時為什么會出現粗大晶粒

來源:http://www.fuzore.com  發布時間:2020-04-26 10:37:59  

  一、粗大晶粒產品的原因
  1、 Causes of coarse grain products
  在一定條件下,鋁及鋁合金板、棒及鍛件在后續熱處理過程中會在組織中形成較大的再結晶晶粒。這種粗粒的存在,會降低材料的力學性能,使深沖零件的表面變得粗糙或產生沖擊裂紋。因此,獲得均勻的細晶粒結構是生產粗晶粒,具有化學成分的合金,均勻的退火體系,變形溫度?并對變形程度、固溶體熱處理溫度、加熱速度、退火溫度、保溫時間等因素進行了分析。
  Under certain conditions, large recrystallized grains will be formed in the structure of aluminum and its alloy plates, bars and forgings during the subsequent heat treatment. The existence of such coarse particles will reduce the mechanical properties of the material and make the surface of the deep drawing parts rough or produce impact cracks. Therefore, to obtain uniform fine grain structure is to produce coarse grain, alloy with chemical composition, uniform annealing system, deformation temperature. The factors such as deformation degree, solution heat treatment temperature, heating speed, annealing temperature and holding time are analyzed.

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  二、如何減少鋁板熱處理過程中產生的粗糧
  2、 How to reduce the coarse grain produced in the heat treatment of aluminum plate
  鋁合金板材不容易變形,不容易產生粗大的晶粒。生產中減少或消除粗晶的一般原則是考慮上述因素,并根據具體情況采取適當的控制或消除措施。
  Aluminum alloy plate is not easy to deform and produce coarse grains. The general principle of reducing or eliminating coarse grains in production is to consider the above factors and take appropriate control or elimination measures according to the specific situation.
  三是以3A21鋁板為例,看到粗粒的消除
  Third, take 3A21 aluminum plate as an example to see the elimination of coarse particles
  對于易產生粗晶的3A21合金退火板,可以采取以下措施來預防或消除:
  The following measures can be taken to prevent or eliminate the 3A21 alloy annealing plate which is easy to produce coarse grains:
  (1) 3A21合金半連續鑄錠高溫退火或熱軋時,溫度必須控制在500~520℃范圍內。
  (1) When 3A21 alloy semi continuous ingot is annealed or hot rolled at high temperature, the temperature must be controlled in the range of 500 ~ 520 ℃.
  (2)當Mn和Fe的總質量分數小于1.8%時,w(Mn)=?在1.5%-1.4%時,w(Fe)>應控制0.4%,或w(Ti)=?0.1% ~ 0.2%的鈦。
  (2) When the total mass fraction of Mn and Fe is less than 1.8%, when w (MN) =? Is 1.5% - 1.4%, w (FE) > should control 0.4%, or w (TI) =? 0.1% - 0.2% titanium.
  建議在鹽浴中退火。如采用空氣爐,應盡量采用高溫快速退火。
  Annealing in a salt bath is recommended. If air furnace is adopted, high temperature and rapid annealing shall be adopted as far as possible.
  (4)在退火前,成品的加工率一定要避免達到臨界變形程度。一般來說,退火前成品的冷變形程度應控制在75%以上。
  (4) Before annealing, the processing rate of the finished product must avoid the critical deformation. Generally speaking, the degree of cold deformation of the finished product should be controlled above 75% before annealing.
  對于工業純鋁退火片材,可以采取以下措施來防止粗粒的產生:
  For industrial pure aluminum annealed sheet, the following measures can be taken to prevent the generation of coarse particles:
  (1)純鋁錠半連鑄采用350~500℃的軋制溫度為宜,軋制溫度控制在上限,軋制終溫不低于300℃
  (1) The proper rolling temperature for semi continuous casting of pure aluminum ingot is 350 ~ 500 ℃, the rolling temperature is controlled at the upper limit, and the final rolling temperature is not less than 300 ℃
  (2)退火前的冷變形程度不小于50%。
  (2) The cold deformation degree before annealing shall not be less than 50%.
  (3)宜在鹽浴中退火,而在空氣爐中退火時,應盡量提高加熱速度。
  (3) It is better to anneal in salt bath, while in air furnace, the heating speed should be increased as much as possible.
  鋁板生產廠家嚴格控制鋁板產品的質量,如果您對鋁板有要求,請聯系我們的銷售經理,給您一個全面的解決方案。
  Aluminum plate manufacturers strictly control the quality of aluminum plate products. If you have requirements for aluminum plate, please contact our sales manager to give you a comprehensive solution.

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