Effect of molybdenum addition on precipitate coarsening kinetics in Inconel 740H: A phase-field study

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2024-10-14 DOI:10.1016/j.intermet.2024.108513

Sourav Ghosh , Hemanth Kumar , Christian Brandl , Abhik N. Choudhury , Saswata Bhattacharyya , Rajdip Mukherjee

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Abstract

Inconel 740H (IN740H) has emerged as an important candidate for the advanced ultra-supercritical (AUSC) steam turbines due to its superior microstructural stability and creep resistance under service conditions. In the present work, we have reparameterized a multicomponent Ni-based superalloy (IN740H) into an equivalent ternary Ni-Al-Mo superalloy, based on the partitioning coefficients of the elements, using the thermodynamic database (CALPHAD). We use this thermodynamic description to employ a quantitative phase-field model to assess the long-term stability of γ′ precipitates in IN740H utilizing GPU-based supercomputing architecture. The assessment helps us to enhance our understanding of the effect of the atomic diffusivity of Mo on coarsening kinetics of the γ′-precipitates in equivalent ternary Ni-Al-Mo superalloy. Investigation reveals that our phase-field model can accurately predict the experimentally observed coarsening kinetics in IN740H.

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添加钼对 Inconel 740H 中沉淀粗化动力学的影响：相场研究

Inconel 740H（IN740H）因其在使用条件下具有优异的微观结构稳定性和抗蠕变性，已成为先进超超临界（AUSC）蒸汽轮机的重要候选材料。在本研究中，我们根据元素的分配系数，利用热力学数据库（CALPHAD）将多组分镍基超耐热合金（IN740H）重新参数化为等效的三元镍-铝-钼超耐热合金。我们利用这一热力学描述，采用定量相场模型，利用基于 GPU 的超级计算架构，评估 IN740H 中 γ′ 沉淀的长期稳定性。该评估有助于我们进一步了解钼原子扩散性对等效三元镍-铝-钼超合金中γ′沉淀物粗化动力学的影响。研究表明，我们的相场模型可以准确预测在 IN740H 中实验观察到的粗化动力学。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.