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標題: 常用鋁鎂矽/鋁鋅鎂銅合金熱鍛粗晶問題研究
On the formation of coarse grains in Al-Mg-Si/Al-Zn-Mg-Cu alloys after hot forging
作者: 林章清
Lin, Chang-Ching
關鍵字: hot-forging
出版社: 材料工程學系所
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摘要: 在運輸工業上,因為追求“輕”的極致,不同材料的比強度(Specific Strength)常會被拿來討論,讓鋁合金的應用越來越受到重視。傳統零件成形,不外乎鑄造和鍛造兩大基本領域;由於鍛造強迫材料塑性變形,使材質緻密化、均質化,並獲得優良的抗疲勞性、韌性及耐衝擊性,所以為製程考慮的首選。不幸的,晶粒粗大問題一直困擾鍛造業,造成機械性質和表面處理的不穩定。國內鍛造業還處於試誤法的階段,國外已經有不同的思考模式,想解決此問題。本研究以控制原物料品質和製程中加熱參數的方式,來研究此問題。重心放在6061,6066,7050,三種比較常用的鍛造用鋁合金。先以成分比較/導電率量測/橫切面硬度/金相觀察的方式,來選擇鍛造胚料。接著改變製程參數(胚料溫度/胚料加熱時間/模具溫度/熱處理方法),來觀察機械性質/晶粒大小/導電率變化。本實驗發現,如果要追求較小的晶粒。同樣是鋁鎂矽合金,6061和6066的最佳鍛造溫度便有差異;6066的最佳鍛造條件比6061高約60℃,並不是業界所認為“鍛造預熱溫度越低,最終晶粒越小”。而鋁鋅鎂銅合金的7050,原物料的退火狀態,對最終的晶粒分佈,影響相當大,使用退火完整的材料,可以得到比較細而均勻的晶粒分布,並大幅提升強度,而仍然維持其韌性。在實務上,也可以藉由導電率量測,了解工件的析出狀況,搭配拉伸試驗所得的數據,進一步調整製程參數,得到最終所需的機械性質。
In order to seek for the top-class of “light”, lots of different materials' “specific strength” is reviewed in the transport industry. So “Aluminum-alloy” applications are keeping growing up. Traditional forming-way are casting and forging. Due to that we can get more uniform structure and better fatigue strength and toughness via forging process, so it has been the first choice of the consideration. Unfortunately, “Coarse-Grains” issue keeps upset the forging industry, cause big problem on mechanical properties and surface-treatment .The forging industry still use “Try and Error” method on this issue, but people in other places have been having some different view points to try to overcome this problem.We try to control raw material quality and forging parameter to study this issue, will focus on 6061, 6066 and 7050. The three most popular forging aluminum alloys. First, we will try do some study about composition-comparison/electrical-conductivity/cross-section hardness/microstructure observation to select the suitable raw material rod. Later, we will change the parameter (billet temperature/billet heating time/tooling temperature/heat-treatment) to see the change about mechanical properties/grain size/electrical conductivity. We found that if we wish to get smaller grain, even both 6061 and 6066 are Al-Mg-Si alloy, the best billet temperature are not the same.6066's “best point” is 60℃ higher than 6061. It is not like what the proverb say “the lower billet temperature, the smaller grain”. For 7050, annealed status of raw material will be a very important factor for final grain distribution of final forging parts. If we use “good” annealed status raw material, can get smaller and more uniform grain, raise the mechanical properties, and still keep very good toughness. In practical application, we can know precipitation status of forging parts via electrical conductivity, with mechanical properties, via proper adjusting manufacturing parameter, got the proper mechanical properties we need.
Appears in Collections:材料科學與工程學系



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