ON THE NATURE OF DISTRIBUTION OF CARBIDE PHASE IN A CARBONIZED LAYER OF ALLOYED STEELS

Fourteen specimens made from Armco Fe with added Cr (3 specimens with Cr 1.26-2.00%, or Ni (4 specimens with 1.57-4.40%), or W (2 specimens with W 0.83-1.58%), or Mo (2 specimens with Mo 0.47-0.72%) were carburized for 12 hrs. at 920 and then cooled at the rate of 40 degrees/hr. Some of the specimen...

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Bibliographic Details
Main Authors: Natapov,B. S, Vasilenko,G. I, Olshanetskii,V. E
Format: Report
Language:English
Subjects:
CARBIDES
CASE HARDENING
CHROMIUM ALLOYS
Fabrication Metallurgy
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
PHASE STUDIES
Properties of Metals and Alloys
STEEL
SURFACE ACTIVE SUBSTANCES
TRANSLATIONS
TUNGSTEN ALLOYS
USSR
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Summary:Fourteen specimens made from Armco Fe with added Cr (3 specimens with Cr 1.26-2.00%, or Ni (4 specimens with 1.57-4.40%), or W (2 specimens with W 0.83-1.58%), or Mo (2 specimens with Mo 0.47-0.72%) were carburized for 12 hrs. at 920 and then cooled at the rate of 40 degrees/hr. Some of the specimens were reheated to 680 and held for 10 hrs. Subsequently the microstructure was detd. microscopically. During retarded cooling of steel within the temp. interval Ac sub m to A sub 1 the elements which are surface-active with regard to austenite, e.g., W, Mo, contribute toward coalescence and spheroidization of the carbide network, while non-surface-active elements (toward austenite), e.g., Ni, Mn, Cr preserve this network. Elements which are surface-active with regard to ferrite, e.g., Cr, increase surface tension at the ferrite-carbide phase boundary and thereby contribute toward spheroidization of finely lamellar pearlite during annealing at temps. slightly below A sub 1. It is recommended that alloying elements be introduced which are surface active toward austenite, e.g., W, Mo, into those steels which will be carburized. (Author) Trans. of Izvestiya Vysshikh Uchebnykh Zavedenii. Chernaya Metallurgiya (USSR) v8 n2 p134-141 1965, by L. Marokus.