Recent content by krautkramer

Thnks graniar for the reply.I was little bit confused with these two terms as PMI is the common term used by industry people.I did a bit research in the internet and found from Exova website that,Atomic Absorption, XRF, EDS, OES, GDS, wet chemistry are Metal's chemical analysis techniques. But,I...

Hi, What is the technical difference between chemical analysis and PMI(Positive material identification)? Is it different name only or chemical analysis is a separate test? I found that FRF analyser (X-Ray fluorescence technique) or Optical Emission spectrometer (spark type gun with ultra pure...

UW U - Unfired W - Welded UCS U - Unfired CS - Carbon Steel

“Although there are no stable carbides in the Ni-C (graphite) system, a metastable carbide (Ni3C) can be produced. (67Ruh) found that splat quenching(Approx.106 Deg.C/s) a molten Ni-C alloy produced a highly super saturated FCC phase, along with Ni3C. Subsequent work by (81Ers) facilitated the...

“The crystalline structure of the solvent material is important. For example carbon atoms diffuse faster in BCC iron than in FCC iron under the same carbon concentration gradient, because the atomic packaging is not as dense in the BCC structure. The lower atomic packaging factor in the BCC...

Hi All, Thanks for the valuable inputs and of course astronuc's solubility theory noted.However, I am curious to know whether this phenomena has any connection to the mobility of carbon in B.C.C and F.C.C lattice? In my case both 18Cr-8Ni grade weld metal and Inconel 82 or 182 are believed to...

Hi, During dissimilar welding, for example carbon steel to austenitic stainless steel welding by using austenitic stainless steel (18Cr-8Ni grades) filler wire, the chances of carbon migration from carbon steel to stainless steel weld metal will be high if we use a filler metal contains more...

Hi, Carbon has more affinity to Chromium or Nickel? What is the reason for more affinity to one material over another? Any help would be highly appreciated. Thanks

Thanks astronuc for the reply.Is it possible to visible prior austenite grain boundary in a ferrite+pearlite microstructure?I read somewhere that during austenite decomposition, further nucleation is happening in austenite grain boundary. PS:Prior austenite grain boundary term is used in...

What is prior austenite grain boundary?Grain boundary and prior austenite grain boundary are same terminology or different?I am confused:confused: Thanks

Thanks Bavid and Astronuc for the reply. That means, during tempering cycle (ie, heating), retained austenite will not transform to martensite(ie, no possibility for lattice shear and the temperature is well above Ms temp.). Still the possibility of Austenite decomposition to ferrite and carbide...

:rolleyes:,119 views,no reply (right or wrong)so far.I never thought that this was a much complicated question!:smile:

Hi, What changes will happen to retained austenite in a martensite matrix during tempering of martensite in an alloy steel @740 C-760 C (ie, below Ac1 temperature)?Will retained austenite transform to martensite (untempered) during tempering or retained austenite will stay as it is during...

Actually I was looking for Ms temperature raisers in carbon steel.But,I will be more than happy if I could get information on Ms temperature raisers in carbon steel as well as Fe-Ni alloys.

Hi, Is there any elements or compounds other than cobalt, which raise martensite start temperature during solidification of steel.