文章信息/Info

Title:

Determination of Process Parameters to Obtain Recovery Microstructure in Hot Deforming of 2014 Aluminum Alloy after the Pretreatment of Homogenization by Furnace Cooling

文章編號(hào):

1674-3962(2025)12-1153-09

作者:

羅際韜; 孫志超; 趙志龍

西北工業(yè)大學(xué)材料學(xué)院，陜西 西安 710072

Author(s):

LUO Jitao; SUN Zhichao; ZHAO Zhilong

School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China

關(guān)鍵詞:

2014鋁合金; 熱變形行為; 熱加工圖; 顯微組織

Keywords:

2014 aluminum alloy;  hot deformation behavior;  hot processing map;  microstructure

分類(lèi)號(hào):

TG319

DOI:

10.7502/j.issn.1674-3962.202404033

文獻(xiàn)標(biāo)志碼:

A

摘要:

均勻化爐冷預(yù)處理可提高2014鋁合金組織均勻性、降低變形抗力，但熱變形時(shí)易誘發(fā)動(dòng)態(tài)再結(jié)晶，降低斷裂和腐蝕性能，如何實(shí)現(xiàn)其回復(fù)變形、獲得均勻的亞晶組織亟待解決。采用熱模擬壓縮實(shí)驗(yàn)，研究了均勻化爐冷預(yù)處理2014鋁合金在變形溫度370~490 ℃、應(yīng)變速率0��1~10 s-1下的熱變形特征，獲得了變形溫度、應(yīng)變速率和變形量對(duì)動(dòng)態(tài)再結(jié)晶體積分?jǐn)?shù)、晶粒尺寸及形貌的影響規(guī)律。結(jié)果表明：提高變形溫度會(huì)導(dǎo)致平均晶粒尺寸和再結(jié)晶體積分?jǐn)?shù)均增大，提高應(yīng)變速率會(huì)導(dǎo)致平均晶粒尺寸和再結(jié)晶體積分?jǐn)?shù)均減小，提高變形量會(huì)導(dǎo)致再結(jié)晶體積分?jǐn)?shù)增大、平均晶粒尺寸減小。建立了2014鋁合金的熱加工圖，確定了回復(fù)變形為主的熱加工參數(shù)區(qū)間：變形溫度380 ℃～460 ℃，應(yīng)變速率小于6 s-1，并通過(guò)反擠壓工藝實(shí)驗(yàn)驗(yàn)證了其可行性。

Abstract:

The pretreatment of homogenization by furnace cooling can improve the microstructure uniformity and reduce the deformation resistance of 2014 aluminum alloy, but it is easy to induce dynamic recrystallization during hot deformation, thus reduce the alloy fracture and corrosion properties. How to realize its recovery deformation and obtain uniform subgrain structure needs to be solved urgently. In this paper, the hot deformation characteristics of homogenization furnace cold pretreated 2014 aluminum alloy at deformation temperature of 370~490 ℃ and strain rate of 0.1~10 s-1 were studied by thermal simulation compression experiment. The effects of deformation temperature, strain rate and deformation amount on dynamic recrystallization volume fraction, grain size and morphology were obtained. The experimental results showed that increasing deformation temperature would lead to the increase of average grain size and recrystallization volume fraction, increasing strain rate would lead to the decrease of average grain size and recrystallization volume fraction, and increasing deformation amount would lead to the increase of recrystallization volume fraction and the decrease of average grain size. Based on the continuous instability criterion and irreversible thermodynamics principle, the hot processing map of 2014 aluminum alloy were established, and the process parameters to obtain recovery microstructure in hot deforming were obtained: the deformation temperature is 380~460 ℃, and the strain rate should be less than 6 s-1. And its feasibility was verified by counter�瞖xtrusion experiment.