Modelling Creep and Creep Crack Growth of LPBF alloy 718

模拟 LPBF 合金 718 的蠕变和蠕变裂纹扩展

• 批准号: 2368936
• 金额: --
• 依托单位: University of Nottingham
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2368936
• 关键词: Modelling; Creep; Crack; Growth; LPBF

Components manufactured by laser powder bed fabrication (LPBF) are fundamentally limited by their performance for use in critical applications. With respect to high temperature materials produced via LPBF, microstructural defects - such as unfavourable precipitate formation, suboptimal grain size and distribution - and macroscale anomalies - like lack of fusion, intra/inter layer defects - often result in LPBF components performing well below their wrought counterparts.In this work, alloy 718 parts, fabricated using a quad-laser Renishaw machine with different scanning strategies, build orientations and number of lasers, were creep tested at 650 under a 600 MPa load. For a given strategy, a 24% increase in creep life compared to wrought alloy 718 was observed. The build 0rientation was also shown to be a determining factor in the creep failure mechanism.Modelling of creep and Creep crack growth work is underway. It is therefore possible, as a result of this work, to propose build strategies for high temperature creep applications and be able to accurately predict LPBF alloys creeep performance.

通过激光粉末床制造（LPBF）制造的部件从根本上受到其在关键应用中使用的性能的限制。对于通过LPBF生产的高温材料，微观结构缺陷（如不利的析出物形成、次优的晶粒尺寸和分布）和宏观尺度异常（如未熔合、层内/层间缺陷）通常会导致LPBF部件的性能远低于其锻造部件。在这项工作中，使用四激光Renishaw机床以不同的扫描策略制造718合金部件，构建方向和激光器数量，在600 MPa载荷下在650 ℃下进行蠕变测试。对于给定的策略，观察到与锻造合金718相比蠕变寿命增加24%。在蠕变破坏机理中，构造取向也是一个决定性因素。蠕变和蠕变裂纹扩展的模拟工作正在进行中。因此，作为这项工作的结果，有可能提出高温蠕变应用的构建策略，并能够准确地预测LPBF合金的蠕变性能。

项目成果

Multi-laser scan strategies for enhancing creep performance in LPBF

• DOI: 10.1016/j.addma.2021.101948
• 发表时间: 2021-05-01
• 期刊: ADDITIVE MANUFACTURING
• 影响因子: 11
• 作者: Sanchez, Salome;Hyde, C. J.;Clare, A. T.
• 通讯作者: Clare, A. T.

The creep behaviour of nickel alloy 718 manufactured by laser powder bed fusion

• DOI: 10.1016/j.matdes.2021.109647
• 发表时间: 2021-03-25
• 期刊: MATERIALS & DESIGN
• 影响因子: 8.4
• 作者: Sanchez, S.;Gaspard, G.;Clare, A. T.
• 通讯作者: Clare, A. T.

Machine learning to determine the main factors affecting creep rates in laser powder bed fusion.

• DOI: 10.1007/s10845-021-01785-0
• 发表时间: 2021
• 期刊: Journal of intelligent manufacturing
• 影响因子: 8.3
• 作者: Sanchez S;Rengasamy D;Hyde CJ;Figueredo GP;Rothwell B
• 通讯作者: Rothwell B