| About this Abstract |
| Meeting |
2024 AWS Professional Program
|
| Symposium
|
2024 AWS Professional Program
|
| Presentation Title |
Consumable Design using Multi Principal Element Alloy Concept: New Opportunities for Brazing and Welding |
| Author(s) |
Zhenzhen Yu, Benjamin Schneiderman, Aric Adamson, Warren Migletti, Alenxander Hansen, Aaron Wells |
| On-Site Speaker (Planned) |
Zhenzhen Yu |
| Abstract Scope |
Multi principal element alloys (MPEAs) constitute a vast composition space using transition metals with broad subspaces exhibiting a single solid solution phase yielding good mechanical properties and suppression of brittle intermetallic phases due to relatively high mixing configurational entropies. These core characteristics render MPEAs an area of significant interest for novel filler discovery to address existing challenges in the field of brazing and welding. MPEA fillers have the potential to address longstanding weldability challenges for both similar and dissimilar joining because they can accommodate a variety of elements in ductile solid solution phases. For instance, in industries such as aerospace, power generation, and oil and gas, brazing plays a critical role in the assembly and repair of a spectrum of advanced alloys ranging from stainless steels to high-temperature nickel-base superalloys. Factors such as high cost of gold- and silver-base brazing filler alloys, as well as brittleness and gap-width sensitivity of nickel-base fillers with boron or silicon as melting point depressants, motivate the discovery and development of alternative MPEA brazing filler materials. In this work, a suite of computational strategies was developed to enable design of specific MPEA chemistries with fine-tuned melting temperature ranges and chemical compatibility for several joining applications. Specific cases to be presented include (1) a 952°C-liquidus MPEA for brazing stainless steel or Inconel 718, (2) a 1098°C-liquidus MPEA for brazing nickel superalloys (e.g., Haynes 214 and Inconel 738LC), and (3) a 1060°C-liquidus MPEA with carbide powder additions to form a metal-matrix composite filler with graded thermal expansion coefficient and thus enable dissimilar joining of Inconel 740H to silicon carbide for high operation temperatures. Take Haynes 214 for example, the MPEA filler exhibited 28% elongation of brazed thin-sheets in comparison to 18% elongation with the conventional silicon-suppressed BNi-5 foils and the strength of MPEA braze was slightly higher. |
| Proceedings Inclusion? |
Undecided |