Powder Metallurgical Processing For Graded Alloy Microstructures

梯度合金显微组织的粉末冶金加工

• 批准号: 2386299
• 金额: --
• 依托单位: University of Sheffield
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2386299
• 关键词: Powder; Metallurgical; Processing; Graded; Alloy

The understanding of microstructures and their effect upon alloy properties is a key part of metallurgical processing as developers seek materials for harsh applications such as those found in the oil & gas, chemical and aeroengine industries. Enhancement of alloy performance has been achieved for ranges of alloys, including steels and nickel superalloys, by addition of minor elements and thermomechanical processing, thereby manipulating the chemistries and microstructures to provide desired benefits. However, such additions and processing steps are generally performed on bulk alloys, often resulting in undesirable costs in finished components arising from the presence of expensive elemental additions in areas where they serve no purpose. This is particularly the case with additions of precious metals (platinum, palladium, ruthenium etc.). Such issues can be circumvented, for example, by deposition of surface coatings. However, thin surface coatings can be subject to degradation by in-use environmental conditions, exposing the underlying unprotected alloy and shortening component lifetime.In this project we will examine routes for generating asymmetric "graded" alloy microstructures to provide property enhancement at the surface of components, where they are needed, avoiding the cost of bulk alloying additions. Concentrating upon powder metallurgical processing to generate the graded microstructures, we will introduce precious metals into the surfaces of steels and nickel superalloys, examining the effect upon the microstructures, the interactions of the modified microstructures with the underlying base alloys, thermomechanical properties and corrosion resistance under environmental conditions relevant to the end-use applications of those alloys. The industrial partners, Johnson Matthey and Liberty Powder Metals, will work closely with the student to provide complementary manufacturing and characterization facilities, thereby allowing the successful student to gain experience of both base metal and precious metal-containing alloys.

了解微观结构及其对合金性能的影响是冶金加工的关键部分，因为开发人员正在寻找适合恶劣应用（例如石油和天然气、化学和航空发动机行业中的材料）的材料。通过添加微量元素和热机械加工，可以提高各种合金（包括钢和镍高温合金）的合金性能，从而控制化学成分和微观结构以提供所需的优点。然而，此类添加和加工步骤通常在大块合金上进行，通常会因在无用的区域中存在昂贵的元素添加而导致成品部件产生不希望的成本。添加贵金属（铂、钯、钌等）时尤其如此。这些问题可以通过例如表面涂层的沉积来避免。然而，薄的表面涂层可能会因使用环境条件而退化，暴露出下面未受保护的合金并缩短部件寿命。在这个项目中，我们将研究生成不对称“渐变”合金微观结构的途径，以在需要的地方增强部件表面的性能，从而避免大量合金添加的成本。我们将重点关注粉末冶金加工以产生分级微观结构，将贵金属引入钢和镍高温合金的表面，研究对微观结构的影响、改性微观结构与底层基础合金的相互作用、与这些合金的最终用途相关的环境条件下的热机械性能和耐腐蚀性能。工业合作伙伴庄信万丰和 Liberty Powder Metals 将与学生密切合作，提供互补的制造和表征设施，从而使成功的学生获得贱金属和含贵金属合金的经验。