Question

3c-3f help final in 2 days

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 beta phase from simple solidification and three alloying components added to Ti to give beta+gamma phases from a eutectic reaction. B. What three alloying elements should you seek for stainless steel to have a bar or plate with reduction of sensitization and why? C. Liquid Hf-Nb alloy infuses into a B.С packed bed and reacts to form a HfB2-HC- NbsBe-Nb4Cs composite or the same boride-carbide precipitates embedded in a Hf- Nb alloy matrix. Determine the mass of Hf and Nb needed to give you sufficient NbsBs and Nbc3 in a hafnium metal matrix caused by adding 20% excess hafnium needed for the formation of 1 kg of HfB2 with carbide particles. D. What three refractories should you consider to contain the liquid Nb-Hf system? E. A hafnium-niobium melt contained in a graphite or carbon crucible (1 cm thick and 5 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 HiC at 20 pm/sos and 7 pm/so5 at 2300°C and 1800°C, respectively. The entire Hf-Nb-B-C system is heated to 3500°C, how much faster or slower will HtC grow than NbC assuming the figure below gives the diffusion coefficient of carbon in cm2/s? F. From the Nb-C phase diagram, below, give the three-phase reactions for a eutectic, peritectic, peritectoid, and euctectoid reactions along with the temperatures at which they occur.

Answer 1

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