Electronic Resource
Investigation of the Feasibility of Producing Tungsten-Hafnium Carbide Alloy by Powder Metallurgical Techniques.
| العنوان: | Investigation of the Feasibility of Producing Tungsten-Hafnium Carbide Alloy by Powder Metallurgical Techniques. |
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| المؤلفون: | WESTINGHOUSE ELECTRIC CORP PITTSBURGH PA ADVANCED ENERGY SYSTEMS DIV, Ammon,Robert L |
| المصدر: | DTIC AND NTIS |
| بيانات النشر: | 1978-03 |
| نوع الوثيقة: | Electronic Resource |
| مستخلص: | By virtue of its excellent elevated temperature strength, the W-0.35HfC alloy is a candidate air vane leading edge material for hypersonic missile application. Because of difficulties associated with arc melting and extrusion of large ingots of this alloy, the feasibility of producing material by powder metallurgy techniques with mechanical properties equivalent to arc cast material was investigated. Three consolidation approaches were evaluated. In Process A, deoxidized tungsten powder was blended with hafnium hydride and graphite powder, encapsulated in mild steel cannisters, and dehydrided under vacuum at elevated temperature. In Process B, deoxidized tungsten powder was blended with degassed hafnium carbide, encapsulated in mild steel cannisters, and evacuated. In Process C, prealloyed W-0.35HfC powder was encapsulated in mild steel cannisters and hydrogen deoxidized at elevated temperatures followed by evacuation. Process A and B powders were consolidated by extrusion at 2300 F. The resulting materials had oxygen levels and controlled carbon levels comparable to arc cast material. Mechanical properties of these materials did not approach those of arc cast material due to incomplete densification and incomplete homogenization of the HfC. Additional thermal-mechanical processing appears to be necessary to improve mechanical properties. The prealloyed WHfC powder, Process C, could not be extruded at 2300 F. However, the material was successfully extruded at 3600 F and had tensile strength equivalent to arc cast material. |
| مصطلحات الفهرس: | Properties of Metals and Alloys, Fabrication Metallurgy, LEADING EDGES, POWDER METALLURGY, TUNGSTEN ALLOYS, MECHANICAL PROPERTIES, TENSILE STRENGTH, HAFNIUM COMPOUNDS, PROCESSING, EXTRUSION, CARBIDES, HEAT TREATMENT, CHEMICAL ANALYSIS, HYPERSONIC VEHICLES, DEGASIFICATION, AS661, PE62113A, Text |
| URL: | |
| الاتاحة: | Open access content. Open access content APPROVED FOR PUBLIC RELEASE |
| ملاحظة: | text/html English |
| Other Numbers: | DTICE ADA055056 831755637 |
| المصدر المساهم: | From OAIster®, provided by the OCLC Cooperative. |
| رقم الانضمام: | edsoai.ocn831755637 |
| قاعدة البيانات: | OAIster |
| الوصف غير متاح. |