元素添加方式对激光熔覆沉积Ti-25V-15Cr成形性的影响
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摘要
目的以阻燃钛合金Ti-25V-15Cr为研究对象,主要研究V、Cr元素粉末的添加方式对激光熔覆沉积Ti-25V-15Cr合金的显微组织及成形性的影响。方法分别以经过粘结包覆Ti(150mm)+V(15mm)+Cr(15mm)、直接混合Ti(150mm)+V(15mm)+Cr(15mm)以及直接混合Ti(150mm)+V(100mm)+Cr(150mm)的元素混合粉末为原料,进行激光熔覆沉积实验,对沉积试样的高度、宽度以及显微组织特征进行研究。结果以粘结包覆Ti(150mm)+V(15mm)+Cr(15mm)和直接混合Ti(150mm)+V(100mm)+Cr(150mm)为原料获得的沉积试样,其沉积效率显著高于直接混合Ti(150mm)+V(15mm)+Cr(15mm)为原料的沉积试样,且沉积试样组织由相对细小的等轴晶和类等轴晶组成,而直接混合Ti(150mm)+V(15mm)+Cr(15mm)为原料的试样组织主要由外延生长的柱状晶组成。结论以粘结包覆Ti(150mm)+V(15mm)+Cr(15mm)为原材料时,在提高沉积效率的同时能够一定程度上细化晶粒。该方法对激光熔覆沉积材料的成形性、成分均匀性及显微组织具有显著影响。
The work aims to investigate the effect of the addition method of elemental powders V and Cr on the microstructure and formability of laser cladding deposited Ti-25 V-15 Cr alloy with Ti-25V-15 Cr alloy as research subject. The deposition experiments were performed from three kinds of powder feedstock, including bonded coated Ti(150 mm)+V(15 mm)+Cr(15 mm),directly mixed Ti(150 mm)+V(15 mm)+Cr(15 mm) and directly mixed Ti(150 mm)+V(100 mm)+Cr(150 mm), and the height,width and microstructure of the deposited samples were analyzed. Deposited efficiency of the samples from the bonded coated Ti(150 mm)+V(15 mm)+Cr(15 mm) and directly mixed Ti(150 mm)+V(100 mm)+Cr(150 mm) were much higher than that from the directly mixed Ti(150 mm)+V(15 mm)+Cr(15 mm). The microstructure of the deposited samples from Ti(150 mm)+V(15mm)+Cr(15 mm) and from directly mixed Ti(150 mm)+V(100 mm)+Cr(150 mm) were mainly composed of fine equiaxed grains and near-equiaxed grains, while that from the directly mixed Ti(150 mm)+V(15 mm)+Cr(15 mm) consisted of epitaxially columnar grains. When the bonded coated Ti(150 μm) + V(15 μm) + Cr(15 μm) is used as the deposited material, the grain size can be refined to some extent while the deposition efficiency can be improved. This method has a significant influence on the formability, composition uniformity and microstructure of the laser cladding deposited samples.
The work aims to investigate the effect of the addition method of elemental powders V and Cr on the microstructure and formability of laser cladding deposited Ti-25 V-15 Cr alloy with Ti-25V-15 Cr alloy as research subject. The deposition experiments were performed from three kinds of powder feedstock, including bonded coated Ti(150 mm)+V(15 mm)+Cr(15 mm),directly mixed Ti(150 mm)+V(15 mm)+Cr(15 mm) and directly mixed Ti(150 mm)+V(100 mm)+Cr(150 mm), and the height,width and microstructure of the deposited samples were analyzed. Deposited efficiency of the samples from the bonded coated Ti(150 mm)+V(15 mm)+Cr(15 mm) and directly mixed Ti(150 mm)+V(100 mm)+Cr(150 mm) were much higher than that from the directly mixed Ti(150 mm)+V(15 mm)+Cr(15 mm). The microstructure of the deposited samples from Ti(150 mm)+V(15mm)+Cr(15 mm) and from directly mixed Ti(150 mm)+V(100 mm)+Cr(150 mm) were mainly composed of fine equiaxed grains and near-equiaxed grains, while that from the directly mixed Ti(150 mm)+V(15 mm)+Cr(15 mm) consisted of epitaxially columnar grains. When the bonded coated Ti(150 μm) + V(15 μm) + Cr(15 μm) is used as the deposited material, the grain size can be refined to some extent while the deposition efficiency can be improved. This method has a significant influence on the formability, composition uniformity and microstructure of the laser cladding deposited samples.
引文
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[2]王华明.高性能金属构件增材制造技术-开启国防制造新篇章[J].国防制造技术,2013(3):5-7.WANG Hua-ming.Additive manufacturing technology for high performance metal components-opening a new chapter in national defense manufacturing[J].National defense manufacturing technology,2013(3):5-7.
[3]SUN S D,LIU Q C,BRANDT M,et al.Effect of laser clad repair on the fatigue behaviour of ultra-high strength AISI4340 steel[J].Materials science and engineering:A,2014,606:46-57.
[4]林鑫,薛蕾,陈静,等.钛合金零件的激光成形修复[J].航空制造技术,2010,(8):55-58.LIN Xin,XUE Lei,CHEN Jing,et al.Laser forming repair of titanium alloy parts[J].Aviation manufacturing technology,2010(8):55-58.
[5]ZHANG C L,YAO C M,WANG C D.Modulations of nonideal repaired damage sites irradiated by CO2 laser at different parameters[J].Optik-international journal for light and electron optics,2016,127(8):3750-3754.
[6]张凤英,刘桐,胡广,等.激光熔覆沉积Ti-20V-15Cr合金的组织演化与硬度[J].应用激光,2017,37(1):1-6.ZHANG Feng-ying,LIU Tong,HU Guang,et al.Microstructure evolution and hardness of laser cladding deposited Ti-20V-15Cr alloy[J].Journal of applied lasers,2017,37(1):1-6.
[7]AZIZI H,ZUROB H,BOSE B,et al.Additive manufacturing of a novel Ti-Al-V-Fe alloy using selective laser melting[J].Additive manufacturing,2018,21:529-535.
[8]BANERJEE R,BHATTACHARYYA D,COLLINS P C,et al.Precipitation of grain boundaryαin a laser deposited compositionally graded Ti-8Al-V alloy an orientation microscopy study[J].Actamaterialia,2004,52(2):377-385.
[9]BANERJEE R,COLLINS P C,BHATTACHARYYA D,et al.Microstructural evolution in laser deposited compositionally gradedα/βtitanium-vanadium alloys[J].Acta materialia,2003,51(11):3277-3292.
[10]SIMONELLI M,ABOULKHAIR N T,COHEN P,et al.Acomparison of Ti-6Al-4V in-situ alloying in selective laser melting using simply-mixed and satellited powder blend feedstocks[J].Materials characterization,2018,143:118-126.
[11]DUTTA B,FROES F H.The additive manufacturing of titanium alloys[J].Advanced materials research,2017,72(2):96-106.
[12]LIU W Y,LIN Y H,CHEN Y H,et al.Effect of different heat treatments on microstructure and mechanical properties of Ti-6Al-4V titanium alloy[J].Rare metal materials and engineering,2017,46(3):634-639.
[13]GASPER A N D,CATCHPOLE S,CLARE A T.In-situ synthesis of titanium aluminidesby direct metal deposition[J].Journal of materials processing technology,2017,239:230-239.
[14]林鑫,李延民,王猛,等.合金凝固列状晶/等轴晶转变[J].中国科学:技术科学,2003,33(7):577.LIN Xin,LI Yan-min,WANG Meng,et al.Solidification columnar crystal/equal crystal transformation of alloy[J].Chinese science:technical science,2003,33(7):577.
[15]赵汉宇.激光立体成形过程中粉末与熔池气液界面微观作用机制[D].西安:长安大学,2017.ZHAO Han-yu.Microscopic mechanism of gasliquid interface between powder and molten pool during laser stereoforming[D].Xi'an:Chang'an University,2017.