Tailoring the Properties of a Ni-Based Superalloy via Modification of the Forging Process: an ICME Approach to Fatigue Performance
Tailoring the Properties of a Ni-Based Superalloy via Modification of the Forging Process: an ICME Approach to Fatigue Performance
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通过改进锻造工艺来定制镍基高温合金的性能：ICME 疲劳性能方法
DOI：
10.1007/s40192-017-0103-6
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发表时间：
2017
影响因子：
3.3
通讯作者：
Sangid, Michael D.
中科院分区：
文献类型：
--
作者：
Detrois, Martin;Rotella, John;Hardy, Mark;Tin, Sammy;Sangid, Michael D.
传统上，材料设计和性能修改通常与成分变化相关。然而，制造工艺参数的细微变化也会对最终材料性能产生巨大影响。在这项工作中，采用集成计算材料工程（ICME）框架来定制镍基高温合金RR1000的疲劳性能。现有的疲劳模型用于识别促进疲劳寿命提高的微观结构特征，即均匀的细晶粒尺寸分布、随机取向、明显的晶界分布（特别是高孪晶界密度和有限的低角度晶界）。的变形机制图和晶界工程的RR1000的过程模型被用来确定最佳的热机械加工参数，以实现这些理想的微观结构特征。为了验证，小规模的锻件RR1000生产和热处理，以获得细晶粒和粗晶粒显微组织，代表传统的处理和晶界工程（GBE）的条件下，分别。对于RR1000的四种微观结构变体中的每一种，表征了孪晶密度和晶粒尺寸，并且与所需的微观结构属性一致。为了验证材料的变形机制和疲劳行为，进行高分辨率数字图像相关，以生成相对于微观结构特征的应变图。高密度的孪晶界被证实抑制滑移带的长度，这是直接归因于延长的疲劳寿命。因此，这项研究表明，模型的成功作用，工艺和性能，在设计和制造镍基高温合金盘锻件。
Traditionally, material design and property modifications are usually associated with compositional changes. Yet, subtle changes in the manufacturing process parameters can also have a dramatic effect on the resulting material properties. In this work, an integrated computational materials engineering (ICME) framework is adopted to tailor the fatigue performance of a Ni-based superalloy, RR1000. An existing fatigue model is used to identify microstructural features that promote enhanced fatigue life, namely a uniform, fine grain size distribution, random orientation, a distinct grain boundary distribution (specifically high twin boundary density and limited low-angle grain boundaries). A deformation mechanism map and process models for grain boundary engineering of RR1000 are used to identify the optimal thermo-mechanical processing parameters to realize these desirable microstructural features. For validation, small-scale forgings of RR1000 were produced and heat-treated to attain fine grain and coarse grain microstructures that represent the conventionally processed and grain boundary engineered (GBE) conditions, respectively. For each of the four microstructural variants of RR1000, the twin density and grain size were characterized and were in agreement with the desired microstructural attributes. In order to validate the deformation mechanisms and fatigue behavior of the material, high-resolution digital image correlation was performed to generate strain maps relative to the microstructural features. The high density of twin boundaries was confirmed to inhibit the length of slip bands, which is directly attributed to extended fatigue life. Thus, this study demonstrated the successful role of models, both process and performance, in the design and manufacture of Ni-based superalloy disk forgings.
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