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鋁鎂合金8和13有很高的机械性能(8的抗拉强度≥28公斤/毫米~2,見2685-53)和抗腐蝕性,且比重很小(2.55),因此在国內外的造船、航空等工业中得到广泛应用?蔫T造工艺比較复杂和較难掌握,热处理規范要求也极严,偶一不慎,就会造成成批廢品。現将我們的經驗簡介如下。一、熔炼及澆注的特点8及3中含有較多的鎂(8含鎂达11.5%),在熔融状态有强烈的氧化和吸气傾向,因此熔炼时必須采取有效措施,以防止合金在熔炼及澆注过程中吸气、氧化和在冷却过程中析出气体,并进行精炼以排除合金液中溶解的气体和氧化夹杂。为此,我們对下列各方面进行了慎重考虑。
Aluminum-magnesium alloy 8 and 13 have high mechanical properties (tensile strength of 8 ≥ 28 kg / mm 2, see 2685-53) and corrosion resistance, and the proportion is very small (2.55), so the shipbuilding at home and abroad , Aviation and other industries have been widely used? 蔫 T made of more complicated and difficult to master, norms of heat treatment requirements are extremely strict, accidentally, it will result in bulk waste. Now our experience is as follows. Melting and casting characteristics 8 and 3 contain more magnesium (8 Mg up to 11.5%), in the molten state has a strong tendency to oxidation and inspiratory, melting must take effective measures to prevent the alloy in the smelting And the process of aspiration, oxidation and precipitation of gas during the precipitation process, and refining to exclude the alloy dissolved gas and oxidation inclusions. To this end, we have carefully considered the following aspects.