X-ray study of triclinic carbides in hadfield's Mn-steel

Triclinic carbide is reported to be formed as Widmanstatten plates from the austenitic phase in steels containing silicon. These carbides were produced in Hadfiedl's high Mn-steel after heat treatment and extracted using suitable chemical reagents. Debye-Scherrer X-ray powder photographs of this material were obtained. Suitable exposure conditions produced up to 21 diffraction lines. These lines were indexed referring to a triclinic unit cell whose lattice parameters were refined using a computer program. All lines are consistent with the following lattice parameters: a is aprox. equal to 6.2711 A; b is approx. equal to 5.095 A; c is approx. equal to 4.5515 A' alpha is aprox. equal 89.02; beta is approx. equal 67.02; gamma is approx. equal to 82.01. These lattice constants are in the agreement with the previously determined values obtained by electron diffraction technique. (author)