Improved Production of Steel Parts by Intensive Quenching
N.I. Kobasko, L.C.F. Canale, G.E. Totten:
IMPROVED PRODUCTION OF STEEL PARTS BY INTENSIVE QUENCHING,
1st International conference on heat treatment and surface engineering of tools and dies, IFHTSE 2005 (08 – 11 June 2005, Pula, Croatia)
In this paper, intensive quenching of the half– axles and the conditions which produce optimal results are reviewed. Service life of axles made of plane carbon steel and intensively quenched is greater than that achievable by oil quenching of alloy steel. This is explained by high compressive stresses formed at the surface of the axles. High compressive stresses at the surface is achieved if cooling rate of steel part is sufficiently high. Intensive quenching methods can be easily used for quenching steel parts with minimal cross-section dimensional variations. However, when one section of a steel part is very thin and another is relatively thick, the use of intensive quenching of a thin part may produce tensile stresses and cracking because it is not possible to form a uniform hardened martensite shell around the surface of steel part.