Influence of quenching agents on distortion of modified navy-c rings made of heat-treatment steel 4140

J. Grum, S. Božič, M. Zupančič:
INFLUENCE OF QUENCHING AGENTS ON DISTORTION OF MODIFIED NAVY-C RINGS MADE OF HEAT-TREATMENT STEEL 4140

Proceedings of the 8th Seminar of the International Federation for Heat Treatment and Surface Engineering , IFHTSE 2001, Dubrovnik- Cavtat, Croatia, 12 – 14 September 2001.

ABSTRACT:
The industrial production demands higher and higher material quality, so that the desired properties of individual parts after mechanical and heat treatment can be assured. Beside the desired properties, steel users must also assure such a heat-treatment process which produces minimum distortions of machine parts. Thus they demand from manufacturers a specified quality, which is to be defined by various properties. Testing with Navy-C rings is a standardised test for evaluation of changes of shape and in size under chosen heat-treatment conditions. With research of various heat-treatment conditions with a Navy-C ring, the efficiency of previous tests and the use of a 10% polymer water solution in quenching of heat-treatment steel 4140 was confirmed. Numerous quenching tests repeated in water, oil, and the 10% polymer water solution were performed. The results concerning distortion of the Navy-C ring are presented in a tabular form, which permits a good judgement on the susceptibility of the tested steel to changes in size.


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