Electron Beam/Laser Glazing of Iron-Base Materials.
Annual progress rept.,
CONNECTICUT UNIV STORRS INST OF MATERIALS SCIENCE
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The development of a programmable scanning system on an electron beam surface melting unit makes it possible to produce a rapidly quenched surface layer on a substrate material. This capability facilitates a fuller characterization of electron beam glazed hard iron-base materials which include M2 tool steel and several alloyed steels dispersion strengthened with titanium carbides particles. These latter materials following glazing treatment exhibit ultra-refinement of the microstructure and microhardness values well in excess of those normally obtained. Preliminary slidingimpact wear studies indicate that relatively thin approximately 50 micrometers glazed layers reduce surface erosion, however, isolated cracks form at periodic intervals across the surface. Finally, in a high carbon - low alloy steel laser-glazing and E.B.-glazing produced, in some instances, strikingly different microstructures and correspondingly different microhardness values. It is proposed that the nature of the glazing atmosphere contributes to this effect. The results are consistently interpreted on the basis of the nucleation of martensite by either small oxide or carbide particles. Author
- Fabrication Metallurgy
- Particle Accelerators