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 Categories >> Engineering >> Metallurgy       
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  Question  Asked @ Answers Views     select
What are the superalloys used for?  1  1138
What are the superalloys?  3  2623
Why is non-destructive testing necessary?  9  2336
What kinds of NDT methods are available?  9  3909
What kind of components are fabricated from the superalloys, and what are their roles?  2  753
Why are the superalloys used for land-based turbines?  1  696
What kind of shell systems are used for investment casting?  2  807
What is investment casting?  3  1019
Is it possible to design heat treatment processes such that a gradient in grain size is produced?  4  751
How can Residual stresses in superalloy components can be minimised?  1  921
The processes used to fabricate the superalloys seem fairly mature. Is much process development going on?  2  616
What is Vacuum Induction Melting ?  3  964
Why do some of the latest 'single crystal' superalloys contain concentrations of the grain boundary strengthening elements, e.g. carbon and boron?  0  300
What happens to the microstructure during service exposure?  0  399
Why do the Gamma Prime and Gamma Double Prime phases play such an important role in promoting strength in the superalloys?  1  1140
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Un-Answered Questions
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i need manual solution of diffusion in solid(shewmon) if you have plz send for me. tank you my email : 915  
what should be the exact suction capacity for 3 to 5 mt capacity lead rotary furnace and length of duct line for proper suction for same 290  
what is No.1 Laathing Scrap Bundle ( Mill Scrap ) 383  
Why are the superalloys sometimes subjected to secondary melting processes? 359  
what are the causes of scaling in cast iron, after subjecting it to annealing process. 426  
IS:1239 same code for MS ERW and Seamless pipes ? 214  
white rust formation over zinc plated and passivated fasteners during CED coating. WHY? 566 Wheels-India
how can i prevent the backfire occurrence in copper shaft furnaces? 234  
dear sir i need some information about prevent eutectic carbide network(as cast) formation in 12% cr steel casting by another alloying element(my analays: c=1.2-1.4 cr=11-13 mo=0.2-0.4 ni=0.2-0.4 )or break network carbid after formation in solidification by heat tretment please help me my email adress: 405  
where do i get previous question papers of metallurgy? 364  
Why do some of the latest 'single crystal' superalloys contain concentrations of the grain boundary strengthening elements, e.g. carbon and boron? 300  
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. 452 Novellus
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