What metal would be better suited for heat transfer, reliability, and cost...??? I'm currently using Aluminum for a 'hot-wedge'.
3 5033i m going to give an interview for iocl on 5th aug . pls tell me what questions can be answered from metallurgical prospect
IOCL,
2479I 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.
1902any input on how to spec out(if possible) a larger grain structure(3/8" or larger) on a Al 6061 forging material.
1812
The moment of inertia of an area is always least with respect to ?
A plain carbon steel contains 45 wt% of proeutectoid ferrite. Define what is its average carbon content in weight percent? I know that you need to use a tie line in the phase diagram, but my book does not really give a good example to go by
What is carbon steel ?
Discuss advantage of different types of screw.
Is there any way through hardening and anodizing some type of aluminum, it could be as hard as steel? I have hardened steel rollers that run up and down on a ramp along with spring pressure. Alternatively, if you are familiar with snowmobiles, the rollers run on the helix on the secondary clutch.
When we do cardonitriding or casehardening operation for a plain carbon steel the case depth, hardness & microstructure are not alike why and define what are the basic thing, which makes such a difference.
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?
What is a boring tool ?
does any one has gate solutions of 2007,08,09 metallurgical engg papers?
any input on how to spec out(if possible) a larger grain structure(3/8" or larger) on a Al 6061 forging material.
what is the hardness of ohns before heat treatment process and hardness of en series before heat treatment process
what kind of cleaning substance or treatments keep or help prevent cast iron from rusting?
Define what is meant by hardening ability of metals?
How we describe strain aging based on dislocation theory?
acetylene is stored in ?