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how can Steel 1.2767 (45NiCrMo16) ESR become magnetic after machining?

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Elie

Junior Member
Hello everyone,

during some facing experiments of steel 1.2767 ESR with CBN tools, the workpiece became magnetic.
Does anyone know the reason for that?
i know that carbon content and heat generated during machining could cause the steel to become magnetic but I have been facing steel for quiet a while and the samples never became magnetic.
Any help would be appreciated

Cheers
Eli
 
Steel can become magnetized when it is placed in a strong, polarized magnetic field. It can also happen if the power source for a strong AC magnetic field is suddenly cut at some point other than the zero crossing. That's why degaussing devices create an AC magnetic field that is slowly ramped down from its peak to zero.
 
I hear the guys and gals over at the mormon.org have a complete understanding of the issues you speak of. They are always happy to help, why don't you go have a chat with them.
 
What type of machining? If it was held on a magnetic chuck (used on grinding machines, sinker EDM machines etc) it will pick up some magnetism. In fact there usually is a demagnatizer in the shop to get rid of it..
 
what microstructure is the steel supposed to have?

with that much nickel i'd expect the structure to be austenitic, in which case it would not be magnetic. without knowing more about the material, i'd guess that the machining caused a stress-induced martensite transformation

now keep in mind, 0 net magnetic moment (demagnetized) does not mean the material is not magnetic. so if the material is magnetic normally, and it was demagnetized, the machining simply reoriented some of the magnetic domains and gave it a net magnetic moment.
 
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