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Reduction of micro-cracking in nickel superalloys processed by Selective Laser Melting: A fundamental alloy design approach

机译:通过选择性激光熔化处理的镍超合金中微裂纹的减少:一种基本的合金设计方法

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摘要

The Selective Laser Melting (SLM) process generates large thermal gradients during rapid melting of metallic powdered feedstock. During solidification certain alloys suffer from thermally induced micro-cracking which cannot be eliminated by process optimisation. An alloy’s crack susceptibility may reduce by increasing its Thermal Shock Resistance (TSR), potentially achieved through an increase in tensile strength. This hypothesis is investigated with Hastelloy X, a common nickel-base superalloy of known high crack susceptibility when processing SLM. It is demonstrated that through consideration of the imposed rapid solidification conditions, Hastelloy X can be made to form a supersaturated solid solution in the as deposited state. The fundamental solid solution strengthening (SSS) effect is exploited to generate an increase in lattice stress, by increasing the most potent SSS elements present within the alloy, whilst maintaining specification composition. The modified alloy displayed a 65% reduction in cracking and an increase in elevated temperature tensile strength, lending support to the initial hypothesis and identifying a possible approach for developing further SLM crack resistant versions of well-known alloy compositions.
机译:选择性激光熔化(SLM)工艺在金属粉末原料的快速熔化过程中会产生较大的热梯度。在凝固过程中,某些合金会遭受因热引起的微裂纹,这些裂纹无法通过工艺优化来消除。合金的裂纹敏感性可能会通过提高其抗热震性(TSR)来降低,这可能是通过提高拉伸强度来实现的。使用Hastelloy X研究这种假设,Hastelloy X是在加工SLM时已知的高裂纹敏感性的常见镍基高温合金。已经证明,通过考虑强加的快速凝固条件,可以使哈氏合金X形成处于沉积状态的过饱和固溶体。通过增加合金中存在的最有效的SSS元素,同时保持规范的成分,利用了基本的固溶强化(SSS)效应来增加晶格应力。改性合金的裂纹减少了65%,高温抗拉强度提高了,这为最初的假设提供了支持,并确定了进一步开发众所周知的合金组合物的SLM抗裂版本的可能方法。

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