Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第8期    总第113期    2008年8月

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文章编号:1004-0609(2008)08-1383-06
大尺寸喷射沉积耐热铝合金管坯楔压致密化与力学性能
陈振华,陈志钢,陈 鼎,贺毅强,陈 刚

(湖南大学 材料科学与工程学院,长沙 410082)

摘 要:  

基于多道次局部小变形累积致整体成型的工艺思路,采用一种新型的楔形压制工艺,对大尺寸Al-Fe-V-Si耐热铝合金喷射沉积管坯进行有效致密化,压制出尺寸为douter 330 mm×dinner 314 mm×78 mmdouter 330 mm×dinner 312 mm×113 mm的力学性能良好、整体均匀致密、外形圆整的耐热铝合金管材,并对楔形压制的致密化规律及其合金的组织与性能进行研究。结果表明:不锈钢包套在楔形压制过程中可以适当增大静水压力,并改善管坯的温度均匀性,使管坯中的孔洞显著锻合,材料的有效承载面积增加,沉积坯中的弱界面和层状组织得到有效改善,从而使其成形性能得以提高;当楔形压制的变形程度为50.4%时,管坯的力学性能及相对密度由沉积态的σb=125 MPaδ = 15%82%分别提高到301 MPa9.3%99.3%。该工艺适合于加工大尺寸多孔金属管坯,具有经济、实用的优点及较好的工业应用前景。

 

关键词: 耐热铝合金;多层喷射沉积;管坯;楔形压制;致密化;力学性能

Densification and mechanical properties of spray deposited large scale heat-resistant aluminum alloy tubular preforms during wedge pressing
CHEN Zhen-hua, CHEN Zhi-gang, CHEN Ding, HE Yi-qiang, CHEN Gang

College of Materials Science and Engineering, Hunan University, Changsha 410082,China

Abstract:A new wedge pressing process for compressing large scale porous tubular preforms was adopted based on the idea of accumulating local small deformation as to integral forming. Heat-resistant aluminum alloy tubes of douter 330 mm×dinner 314 mm×78 mm and douter 330 mm×dinner 312 mm×113 mm with well mechanical properties, density and good contour were fabricated. Densification behavior, microstructure and mechanical properties of the spray deposited Al-Fe-V-Si tubes during wedge pressing were investigated. The results show that, with increasing hydrostatic pressure and uniformly distributed temperature, the fragile interfaces and lamellar structure in the as-deposited materials are effectively improved, pores are closed and the mechanical properties are substantially upgraded due to increasing effective loading area after the stainless steel package wedge pressing. The mechanical properties and relative density of the deposits increase from 125 MPa, 0.15% and 82% to 301 MPa, 9.3% and 99.3% respectively after the reduction of 50.4%, indicating that the novel method is feasible, practical and cost-effective.

 

Key words: heat-resistant aluminum alloy; multi-layer spray deposition; tubular perform; wedge pressing; densification; mechanical properties

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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