Design of an additively manufactured functionally graded material of 316 stainless steel and Ti-6Al-4V with Ni-20Cr, Cr, and V intermediate compositions
Design of an additively manufactured functionally graded material of 316 stainless steel and Ti-6Al-4V with Ni-20Cr, Cr, and V intermediate compositions
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DOI：
10.1016/j.addma.2022.102649
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发表时间：
2022-03
影响因子：
11
通讯作者：
Lourdes D. Bobbio;B. Bocklund;E. Şimşek;R. Ott;M. Kramer;Zibai Liu;A. Beese
中科院分区：
文献类型：
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作者：
Lourdes D. Bobbio;B. Bocklund;E. Şimşek;R. Ott;M. Kramer;Zibai Liu;A. Beese
本研究提出了一种设计计算信息梯度路径的方法，通过粉末原料的定向能沉积增材制造，以316不锈钢（SS316）和Ti-6Al-4V为终端合金制造功能梯度材料（FGM）。分级是通过引入中间元素和合金（Ni-20Cr， Cr和V）来完成的，以避免在钛合金和不锈钢的直接液相连接中形成脆性的Fe-Ti金属间相。结合平衡计算和Scheil-Gulliver模拟，设计了一条避免有害相的合成路径。制备了女性生殖器切割样品并对其进行了实验表征，以确定该途径的可行性。预测在Ni-20Cr/Cr梯度区域内会发生从fcc到bcc的相变化，并通过实验表征验证了这一点。沿梯度路径没有形成有害相（金属间相，Laves相或σ相），证明了从SS316到Ti-6Al-4V的FGM的成功计算设计和制造。
This study presents a method for designing a computationally informed gradient pathway to fabricate a functionally graded material (FGM) with terminal alloys of 316 stainless steel (SS316) and Ti-6Al-4V via directed energy deposition additive manufacturing with powder feedstock. The grading is accomplished through the introduction of intermediate elements and alloys (Ni-20Cr, Cr, and V) to avoid the brittle Fe-Ti intermetallic phases that form in the direct liquid phase joining of Ti-alloys and stainless steels. Using a combination of equilibrium calculations and Scheil-Gulliver simulations, a compositional pathway was designed to avoid deleterious phases. FGM samples were fabricated and experimentally characterized to determine the viability of the pathway. A change in phases from fcc to bcc was predicted to occur within the Ni-20Cr/Cr gradient region, and this was validated through experimental characterization. No detrimental phases (intermetallic, Laves, or σ phases) formed along the gradient path, demonstrating a successful computationally-informed design and fabrication of an FGM from SS316 to Ti-6Al-4V.