Incremental feeding high-pressure sliding for achieving large area of severe plastic deformation

IF 0.5 4区 材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING
Y. Takizawa, Kyohei Watanabe, T. Kajita, Kosei Sumikawa, T. Masuda, M. Yumoto, Yoshiharu Otagiri, Z. Horita, Z. Horita
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引用次数: 6

Abstract

In this study, high - pressure sliding is combined with incremental feeding so that a severely deformed area is enlarged without increasing the machine capacity. With this combined process ( called the incremental feeding high - pressure sliding: IF - HPS ) , a sheet sample is lateraly fed every after sliding under high pressure. The IF - HPS process was applied to a Ni - based superalloy ( Inconel 718 ) and a Ti - 6Al - 7Nb alloy ( F1295 ) for grain refinement. The applicability of the IF - HPS process is examined with the advent of superplasticity through the grain refinement. Vickers microhardness measurement shows that the hardness is higher in the area of the second pass than the first pass for both Inconel 718 and F1295 but the hardness increase is more prominent in the area where the second passes is superimposed on the first passparticularly for the Inconel 718. After tensile testing, superplastic elongation more than 400 % appears in the superimposed areas of both Inconel 718 and F1295. For the F1295 alloy, the area of the second pass also exhibits a suplerplastic elongation of 400 % . Analysis by finte element method ( FEM ) reveals that strain introduced by outwardflow from the severely deformed area is sensitive to friction coefficient between the sample and anvil outside of the flat contact area. The strain due to this outwardflow conributes to the grain refinement in the second pass for the F1295 alloy but insuf ficient for the Inconel 718. [ doi:10 . 2320 / jinstmet.J2017038 ]
渐进式高压滑动,实现大面积剧烈塑性变形
在本研究中,高压滑动与增量进给相结合,在不增加机器容量的情况下,扩大了严重变形的区域。通过这种组合过程(称为增量进料高压滑动:IF - HPS),薄片样品在高压下滑动后每次横向进料。采用IF - HPS工艺对镍基高温合金(Inconel 718)和Ti - 6Al - 7Nb合金(F1295)进行晶粒细化。通过晶粒细化,验证了IF - HPS工艺的适用性。维氏显微硬度测量表明,Inconel 718和F1295在第二道次的硬度高于第一道次,但在第二道次与第一道次叠加的区域,硬度增加更为明显,尤其是Inconel 718。经拉伸试验,Inconel 718和F1295的叠加区均出现超过400%的超塑性伸长率。对于F1295合金,第二道次的超塑性伸长率也达到400%。有限元分析表明,从严重变形区向外流动所引入的应变对试样与平面接触区外砧间的摩擦系数很敏感。由于这种向外流动而产生的应变有助于F1295合金在第二道次中细化晶粒,但对于Inconel 718则不够。[doi:10]2320 / jinstmet。J2017038]
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来源期刊
Journal of The Japan Institute of Metals
Journal of The Japan Institute of Metals 工程技术-冶金工程
CiteScore
0.70
自引率
0.00%
发文量
27
审稿时长
6-12 weeks
期刊介绍: Information not localized
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