Why do some of the latest 'single crystal' superalloys contain concentrations of the grain boundary strengthening elements, e.g. carbon and boron?

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The requirement for ASTM A217 Gr. WC9 castings for valves components like Body and Bonnet were Normalising at 920+/- 20 Deg. C and Tempring 780+/- 20 Deg. C The specification calls furnace shall be calibtated within +/-14 deg. C The Heat Chart shows minimum temperature for normalising 900 to 920 Deg. C, but maximum temperature 960-990 Deg. C Tempering 780+/-20 Deg. C is within limits and accepted. Casting having integral test bars, heat trated along with castings passed in chemical znalysis and mechanical properties. Since normalising maximum temperature is not meeting specification, where castings can be salvaged or renormalised and retempered to meet specification. Whether it will have affect on remechanical properties testing

0 Answers   Leader Valves,

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What kinds of NDT methods are available?

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Define what is or define what characterize the thermodynamic state of metal (structure of metal)?

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Explain the concept of casting and forging?

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Why are the superalloys used for land-based turbines?

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Are all metals heavy? Explain.

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For what reason would an aluminum casting, when applied with a powder coated paint finish, cause a poor finish to the paintwork.

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What is the use of worm gears?

0 Answers   NIC,

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What are the superalloys?

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What is mean by D2 Material used for Die tooling? What are the composition in that?

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Explain dislocation theory?

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