The invention discloses a non-isothermal high-efficiency creep aging forming method for Al Zn Mg Cu series aluminum alloy sheets. The method adopts reasonable non-isothermal aging system in the creep aging forming process, and integrates creep deformation to realize the integrated manufacturing of forming ability of complex aluminum alloy components. The main step is to first solidify the sheet and quench it immediately. After being placed at room temperature for a certain period of time, the sheet metal is fixed and loaded on the forming die, then gradually rises from room temperature to creep aging maximum temperature at a certain heating rate, and then immediately cools to room temperature at the same rate, and finally unloads. Compared with the traditional creep aging forming process which includes three stages of heating, holding and cooling, the present invention only includes heating and cooling processes, and has no longer holding process. The total forming time is much shorter than that of the traditional creep aging forming process which includes isothermal stage. It can greatly shorten the production cycle, improve the forming efficiency and save the production cost on the premise of guaranteeing the same forming effect. \u3002
【技术实现步骤摘要】
一种Al-Zn-Mg-Cu系铝合金板材非等温高效蠕变时效成形方法
本专利技术涉及一种Al-Zn-Mg-Cu系铝合金板材非等温高效蠕变时效成形方法,属于板金成形加工
技术介绍
蠕变时效成形是为满足航空航天对大型整体壁板类零件的要求而发展起来的一种先进的板材成形技术。在蠕变时效过程中,通过在合适的人工时效温度下加载低于屈服强度的外力,使工件产生初始的弹性变形。随后保持温度和外力的加载,一部分弹性变形将逐渐转变为不可恢复的塑性变形,工件内部同时产生应力松弛现象,微观组织发生时效析出。经冷却、卸载后,工件中残余的弹性变形发生回弹,而塑性变形部分得以保留,最终获得具有一定曲率的时效强化铝合金壁板。Al-Zn-Mg-Cu系铝合金作为一类典型的可热处理强化铝合金,是蠕变时效成形的理想材料。传统蠕变时效成形按温度变化包含三个阶段:升温阶段、保温(等温)阶段、冷却阶段。其中,针对保温阶段,开发出不同的热处理制度,如单级时效、双级时效和三级时效。目前在实际生产过程中主要采取单级时效制度,时效时间取为峰值时效时间,材料强度较高,而腐蚀性能较差,延长时效时间则进入过时效,腐蚀性能得到改善,却牺牲了强度,同时使成形周期变长。对此,Lin等(JournalofAlloysandCompounds,2018,743:448-455)将双级时效制度应用于Al-Zn-Mg-Cu系铝合金的蠕变时效,其中一级时效工艺为120℃×6h,二级时效工艺为120℃~160℃×18h;ArabiJeshvaghania等(MaterialsCharacterization,2012,73(11 ...
【技术保护点】
1.一种Al‑Zn‑Mg‑Cu系铝合金板材非等温高效蠕变时效成形方法,其特征在于:在Al‑Zn‑Mg‑Cu系铝合金板材蠕变时效成形过程中,采用无保温阶段的非等温时效方式,其具体步骤如下:首先将板材固溶处理后,立即水淬,在室温下放置过后,将板材在成形模具上固定、加载,再从室温按一定加热速率逐渐升至蠕变时效最高温度,随后立即按相同速率冷却至室温,最后卸载。
【技术特征摘要】
1.一种Al-Zn-Mg-Cu系铝合金板材非等温高效蠕变时效成形方法,其特征在于:在Al-Zn-Mg-Cu系铝合金板材蠕变时效成形过程中,采用无保温阶段的非等温时效方式,其具体步骤如下:首先将板材固溶处理后,立即水淬,在室温下放置过后,将板材在成形模具上固定、加载,再从室温按一定加热速率逐渐升至蠕变时效最高温度,随后立即按相同速率冷却至室温,最后卸载。2.根据权利要求1所述的Al-Zn-Mg-Cu系铝合金板材非等温高效蠕变时效成形方法,其特征在于:所述固溶温度为470℃~480℃,时间为1h~3h。3.根据权利要求1所述的Al-Zn-Mg-Cu系铝合金板材非等温高效蠕变时效成形方法,其特征在于:所述固溶处理后淬火方式为水淬,淬火转移时间应小于10s。4.根据权利要求1所述的Al-Zn-Mg-Cu系铝合金板材非等温高效蠕变时效成形方法,其特征在于:所述水淬后室温放置时间大于24h。5.根据权利要求1所述一种Al-Zn-Mg-Cu系铝合...
【专利技术属性】
技术研发人员:李恒,边天军,雷超,王雨菲,
申请(专利权)人:西北工业大学,
类型:发明
国别省市:陕西,61
还没有人留言评论。发表了对其他浏览者有用的留言会获得科技券。