(1. 西南鋁業(yè)(集團(tuán))有限責(zé)任公司，重慶 401326；
2. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 研究了2195合金大規(guī)格鍛造管的淬火與時(shí)效工藝。通過(guò)拉伸試驗(yàn)、金相顯微儀和透射電鏡考察了熱處理工藝參數(shù)對(duì)其力學(xué)性能和顯微組織的影響。淬火敏感性試驗(yàn)表明，產(chǎn)品必須采用水冷方式淬火，但對(duì)冷卻水的溫度可以不作嚴(yán)格控制。不同溫度的人工時(shí)效工藝試驗(yàn)表明，低溫峰值時(shí)效可以使產(chǎn)品獲得較高的強(qiáng)度和理想的伸長(zhǎng)率，而時(shí)效溫度升高將導(dǎo)致沉淀相粗化，使產(chǎn)品的強(qiáng)度下降。合理的2195合金鍛造管的淬火工藝為500 ℃固溶、水冷淬火，人工時(shí)效制度為150 ℃時(shí)效195 h。
關(guān)鍵字: 鋁鋰合金；鍛件；熱處理；微觀組織；力學(xué)性能
（1. Southwest Aluminum (Group) Co., Ltd., Chongqing 401326, China;
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:Heat treatment technologies for a large-sized, forged tube of alloy 2195 were studied. The effects of heat treatment parameters on the mechanical properties and microstructure of the product were investigated by means of tensile test, metallography and transmission electron microscopy. The results of quenching-sensitivity test show that, the product must be quenched by water cooling, but no strict limitations are required to the water temperature. The results of tensile test for artificial aging at different temperatures show that the product can achieve high strength and desirable ductility via peak-aging at a relative low temperature. The increase of aging temperature leads to coarsening of precipitates, and hence decreases the strength of the product. The suitable heat treatment technologies for the alloy 2195 forged tube should be that, solution-treated at 500 ℃, water quenching and then artificial aging at 150 ℃ for 195 h.
Key words: Al-Li alloy; forged product; heat treatment; microstructure; mechanical properties
