Question

For high technological industries, you evaluate metals and ceramics beyond the Fe-C alloys to more costly applications. A. Select three alloying components for Ti alloys to give alpa+beta phases from simple solidification or peritectic reaction and beta+gamma phases from a eutectic reaction. B. What alloying elements should you seek for stainless steel to have a bar or plate witth 50% austenite and 50% femte, with a significant martensitic phase, with reduction of sensitization and with reduction of pitting corrosion? C. Liquid Hf-Nb alloy infuses into a B.С packed bed and reacts to form a HfB2-HIC- Nb B4-Nb C composite or the same boride-carbide precipitates embedded in a HI-Nb alloy matrix. Determine the mass of Nb needed to give you sufficient Nb.B, and Nb C in the metal matrix D. How much Hf is needed to produce an Hf-30 wt%Nb alloy at 3200°C for 4C. E. A hatnium-niobium melt contained in a graphite or carbon crucible (1 cm thick and s cm inner diameter) reacts to form an internal layer composed of HIC and NbC at the liquid Hf-Nb/C interface The carbon seems to diffuse through the HfC at 20 um/s and 7 pm/s at 2300 C and 1800 C respectively. The entire HIC/NbC-iquid Hf-Nb/C system is heated to 3200 C will the HtC grow faster than NbC assuming the figure below gives the diffusion coefficient of carbon in cms ow transcribed image text

Answer 1

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