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鈦合金與不銹鋼超塑性擴(kuò)散連接工藝及機(jī)理研究
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陜西省科技計劃資助項(xiàng)目（05KH37）


Techniques and Mechanism of Superplastic Diffusion Bonding between Titanium Alloy and Stainless Steel
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    基于微細(xì)晶超塑性擴(kuò)散連接方法，對TC4鈦合金與1Cr18Ni9Ti不銹鋼成功實(shí)現(xiàn)了直接擴(kuò)散連接，系統(tǒng)分析了接頭性能、界面微觀結(jié)構(gòu)及超塑性擴(kuò)散連接機(jī)理。結(jié)果發(fā)現(xiàn)：TC4鈦合金與1Cr18Ni9Ti奧氏體不銹鋼直接超塑性擴(kuò)散連接時，較佳連接工藝規(guī)范為：溫度T=760~820 ℃，壓力p=6~9 MPa，時間t=20~40 min；接頭剪切強(qiáng)度τ＝125.3~148.7 MPa。與一般直接擴(kuò)散連接相比，連接溫度降低了約100 ℃，接頭的剪切強(qiáng)度提高了1倍以上，且連接試樣無明顯變形。細(xì)化熱處理TC4鈦合金與1Cr18Ni9Ti不銹鋼超塑性擴(kuò)散連接時，其接頭的形成過程大致可分為3個階段：形成緊密接觸階段、接觸表面激活階段及靠近活化中心的界面冶金結(jié)合區(qū)形成階段。

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    Direct diffusion bonding between TC4 titanium alloy and 1Cr18Ni9Ti stainless steel were implemented based on the superplastic diffusion bonding (SDB) method. The joint properties, interface microstructures and the mechanism of superplastic diffusion bonding were analyzed. The results show that for direct superplastic diffusion bonding of TC4 alloy to 1Cr18Ni9Ti stainless steel, the shear strength of TC4/1Cr18Ni9Ti joints is 125.3-148.7 MPa under optimal diffusion bonding conditions including the temperature of 760-820 oC, the bonding pressure of 6-9 MPa and the bonding time of 20-40 min. Compared with the conventional diffusion bonding, the bonding temperature can be reduced by about 100 oC while the shear strength of joints is increased by more than one time. And the bonding specimens have no distinct distortion. In the ultrafine superplastic diffusion bonding of TC4 alloy and 1Cr18Ni9Ti stainless steel, the formation process of the bonded joint can be divided into three stages: close contact forming, activation of contact surface and formation of interfacial metallurgy bonded zone nearby the activation center.

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王 敏,郭鴻鎮(zhèn).鈦合金與不銹鋼超塑性擴(kuò)散連接工藝及機(jī)理研究[J].稀有金屬材料與工程,2010,39(11):1964~1969.[Wang Min, Guo Hongzhen. Techniques and Mechanism of Superplastic Diffusion Bonding between Titanium Alloy and Stainless Steel[J]. Rare Metal Materials and Engineering,2010,39(11):1964~1969.]
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  • 收稿日期:2009-12-20
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