Ti-22Al-24Nb-0.5Mo粉末合金的制备及电子束焊接<sup>*</sup>

doi:10.11900/0412.1961.2016.00019

金属学报

2016, Vol. 52

Issue (9): 1070-1078 DOI: 10.11900/0412.1961.2016.00019

论文

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Ti-22Al-24Nb-0.5Mo粉末合金的制备及电子束焊接^*

吴杰,徐磊(

),卢正冠,崔玉友,杨锐

中国科学院金属研究所, 沈阳 110016

PREPARATION OF POWDER METALLURGY Ti-22Al-24Nb-0.5Mo ALLOYS ANDELECTRON BEAM WELDING

Jie WU,Lei XU(

),Zhengguan LU,Yuyou CUI,Rui YANG

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

吴杰,徐磊,卢正冠,崔玉友,杨锐. Ti-22Al-24Nb-0.5Mo粉末合金的制备及电子束焊接^*[J]. 金属学报, 2016, 52(9): 1070-1078.
Jie WU, Lei XU, Zhengguan LU, Yuyou CUI, Rui YANG. PREPARATION OF POWDER METALLURGY Ti-22Al-24Nb-0.5Mo ALLOYS ANDELECTRON BEAM WELDING[J]. Acta Metall Sin, 2016, 52(9): 1070-1078.

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摘要:

采用预合金粉末热等静压工艺制备了Ti-22Al-24Nb-0.5Mo (原子分数, %)粉末合金, 对Ti-22Al-24Nb-0.5Mo粉末合金环坯和板坯进行电子束焊接. 采用OM, SEM, EPMA和X射线三维成像技术对焊接接头的微观组织进行表征, 研究了焊后热处理对焊接接头显微硬度、拉伸性能和持久性能的影响. 结果表明, 热等静压温度显著影响Ti-22Al-24Nb-0.5Mo粉末合金的孔隙分布. 在1030 ^oC热等静压成型的粉末环坯经980 ^oC, 2 h, 真空炉冷热处理后表现出较好的可焊性. 焊接接头熔合区、热影响区和母材的化学成分均匀, 虽然显微组织差异明显, 但是显微硬度无明显区别. 拉伸及持久性能测试试样皆断裂于熔合区. 焊接接头熔合区存在大量的显微孔隙是焊接接头发生断裂的失效机制. 焊后热处理可以减少焊缝处的显微孔隙数量, 从而提高焊接接头塑性及高温持久寿命.

关键词 ：热等静压, Ti-22Al-24Nb-0.5Mo粉末合金, 微观孔隙, 电子束焊接

Abstract：

Ti₂AlNb alloys are considered as a potential structural material for high temperature applications like gas turbine engine components due to their high specific strength and good creep resistance. In this work, pre-alloyed powder of Ti-22Al-24Nb-0.5Mo (atomic fraction, %) was prepared by an electrode induction melting gas atomization process and powder metallurgy (PM) alloys was made through a hot isostatic pressing (HIPing) route. PM Ti-22Al-24Nb-0.5Mo rings and plates were welded by electron beam welding (EBW). The microstructure of the welded joints was investigated by OM, SEM, EPMA and X-ray tomography. The effect of post-weld heat treatments (PWHT) on the microhardness, tensile properties and rupture lifetime at 650 ℃, 360 MPa of the welding joint of PM Ti-22Al-24Nb-0.5Mo plate was also studied. The results show that the HIPing temperature will affect the porosity distribution of PM Ti-22Al-24Nb-0.5Mo alloys. The PM Ti-22Al-24Nb-0.5Mo rings HIPed at 1030 ℃ after 980 ℃, 2 h, vacuum furnace cooling show good weldability. The fusion zone (FZ), heat affected zone (HAZ) and base metal (BM) of welded joints show homogeneous chemical composition. The microstructures of FZ, HAZ and BM are different while the microhardnesses of FZ, HAZ and BM show no obvious differences. Tensile and stress rupture lifetime testing specimens all fracture in the FZ. It is found that there are a certain number of micro-porosity in the FZ of the welded joints. However, the porosity reduces after PWHT, which will improve the high temperature ductility and rupture properties of the PM Ti-22Al-24Nb-0.5Mo welded joints.

Key words： hot isostatic pressing powder metallurgy Ti-22Al-24Nb-0.5Mo alloy porosity electron beam welding

收稿日期: 2016-01-08

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https://www.ams.org.cn/CN/10.11900/0412.1961.2016.00019 或 https://www.ams.org.cn/CN/Y2016/V52/I9/1070

图1 电子束焊后Ti-22Al-24Nb-0.5Mo粉末合金环坯和板坯

图2 Ti-22Al-24Nb-0.5Mo粉末合金焊接接头拉伸及持久性能试样的形状及尺寸

图3 Ti-22Al-24Nb-0.5Mo预合金粉末颗粒表面形貌的SEM像

图4 Ti-22Al-24Nb-0.5Mo预合金粉末的XRD谱

图5 不同热等静压温度下Ti-22Al-24Nb-0.5Mo粉末合金内部显微孔洞大小及分布[11]

表1 Ti-22Al-24Nb-0.5Mo预合金粉末及坯料的化学成分

图6 Ti-22Al-24Nb-0.5Mo粉末合金环坯焊缝组织及X射线探伤结果

图7 Ti-22Al-24Nb-0.5Mo粉末合金板坯焊缝显微组织及元素分布

图8 Ti-22Al-24Nb-0.5Mo粉末合金板坯焊缝显微硬度分布

表2 Ti-22Al-24Nb-0.5Mo粉末合金电子束焊接接头的力学性能

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