What is d2?

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What Is cold working of metals? Give some of its principal methods.

0 Answers   Essar,

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Explain dislocation theory?

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How to calculate heat affected zone in weld?

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Discuss advantage of different types of screw.

0 Answers   Essar,

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Are the grain boundaries a continuation of regular lattice structure from one grain to another? Explain.

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Which type of key is used between shaft and pulley?

0 Answers   NIC,

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You are required to calculate a heat affected zone in weld. How would you do that?

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What does allotropic mean what does iron and steel have to do with it?

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I currently use 17-7 PH stainless which is hardened to condition CH after forming. raw matl is .1.75"X .12" X .008". Its main usage after hardening is silicon wafer retainer where it's contantly cycled up and down to putin and remove wafer after 40-60 sec process at 400C temp. At this high temperature this part seemed to deform after a a couple of hundred wafer which is what it was designed for in the first place. THere is a proposal to go to a different material to increase lifeline of this part. My question is..... can 321 SST be a plugin replacement. I know this has a higher temp rating but how about its forming characteristics, will it have spring properties, and wont become brittle after prolonged exposure to 400C.

0 Answers   Novellus,

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What kind of components are fabricated from the superalloys, and what are their roles?

2 Answers  

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How much gold concentration should be in the organic phase (dbc) before reduction by oxalic acid solution? Is it effective on purity of gold in reduction step? Whatis the ratio of dbc to oxalic acid solution in this step?

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