Investigation into Hot Isostatic Pressing of a 12% Chromium Martensitic Steel and optimisation of the bond to Nickel Based Alloy 625

调查%20到%20热%20等静压%20冲压%20of%20a%2012%%20铬%20马氏体%20钢%20和%20优化%20of%20the%20bond%20到%20镍%20Based%20合金%20625

• 批准号: 2621999
• 金额: --
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2621999
• 关键词: Investigation; into; Hot; Isostatic; Pressing

This research aims to demonstrate and optimise a powder-based manufacturing route to allow Rolls-Royce continued use of Jethete M153 which is already commercially obsolete in its wrought form. Rolls-Royce rely on this alloy primarily for its magnetic performance for a single application but their limited order volumes puts the alloy at serious risk of total obsolescence through loss of a wrought supply chain. The volume and frequency of Rolls-Royce orders is better aligned to a powder supply route. This PhD will explore whether a powder hot isostatic pressing (HIP) manufacturing route can successfully be applied to Jethete M153 and will look further to understand if the component method of manufacture can be overhauled to improve the resulting performance and structural integrity. Rolls-Royce currently uses welding to join wrought Jethete M153 to nickel-based Alloy 625, already manufactured via powder HIP. Moving to a fully powder-based manufacturing route for the component potentially opens up an opportunity to remove this dissimilar metal weld if these materials can be joined via HIP bonding to give an equivalent or improved in-service performance. If successful, this will improve the component structural integrity and reduce the inspection burden during manufacture and assembly with the potential to provide time, cost and performance benefits to Rolls-Royce. In-service performance will be benchmarked against the current baseline of welded and post-weld heat treated quenched and tempered Jethete M153 and solution annealed HIP consolidated Alloy 625. Joining Jethete M153 and Alloy 625 via HIP will alter the in-service condition of the two materials as any post-HIP thermal treatment will need to be applied to both materials simultaneously. Since the magnetic performance of the Jethete M153 is the driving requirement for this component, it is expected that the currently employed quench and temper will also be applied to the HIP consolidated product, however optimisation of this thermal processing will be required to ensure acceptable mechanical performance of the Jethete M153 can be achieved as well as mechanical and environmental performance of the Alloy 625. HIP will alter the microstructure and chemistry of Jethete M153 which may influence its magnetic properties in the service condition. The extent to which this occurs will also be explored (via characterisation, DSC/dilatometry and B-H loop testing) and the HIP powder feedstock studied to understand any potential optimisations which may improve the performance of post-processed HIP Jethete M153.

这项研究的目的是展示和优化一种基于粉末的制造路线，以允许劳斯莱斯继续使用已经在商业上过时的锻造形式的Jethete M153。罗尔斯·罗伊斯主要依靠这种合金的单一应用的磁性，但他们有限的订单量使合金面临严重的淘汰风险，因为失去了锻造的供应链。劳斯莱斯订单的数量和频率更符合粉末供应路线。本博士将探讨粉末热等静压（HIP）制造路线是否可以成功地应用于Jethete M153，并将进一步了解是否可以彻底改变制造组件的方法，以提高最终的性能和结构完整性。罗尔斯·罗伊斯目前使用焊接将锻造的Jethete M153与镍基625合金连接起来，后者已经通过粉末HIP制造。如果这些材料可以通过HIP键合连接，以提供同等或改进的使用性能，那么转向完全基于粉末的组件制造路线可能会为消除这种不同的金属焊缝提供机会。如果成功，这将提高部件的结构完整性，减少制造和装配过程中的检查负担，为劳斯莱斯提供时间、成本和性能方面的好处。服役性能将以目前焊接和焊后热处理、调质Jethete M153和固溶退火HIP固结合金625为基准进行基准测试。通过HIP连接Jethete M153和Alloy 625将改变两种材料的使用状况，因为任何HIP后热处理都需要同时应用于两种材料。由于Jethete M153的磁性是该组件的驱动要求，因此预计目前采用的淬火和回火也将应用于HIP加固产品，但是需要优化这种热处理，以确保Jethete M153的可接受机械性能以及625合金的机械和环境性能。HIP会改变Jethete M153的微观结构和化学性质，从而影响其在使用状态下的磁性能。还将探索这种情况发生的程度（通过表征，DSC/膨胀测量和B-H回路测试），并研究HIP粉末原料，以了解可能提高后处理HIP Jethete M153性能的任何潜在优化。