Metallurgy, Vol. 51 No. 1, 2012.
Original scientific paper
Dilatometric and hardness analysis of C45 steel tempering with different heating-up rates
J. Winczek
; Faculty of Mechanical Engineering and Computer Science, Czestochowa University of Technology, Czestochowa, Poland
A. Kulawik
; Faculty of Mechanical Engineering and Computer Science, Czestochowa University of Technology, Czestochowa, Poland
Abstract
Modelling of technological processes of heat treatment or welding, involving multiple heat source transitions, requires considering the phenomenon of tempering. In work have been presented results of dilatometric research of hardened C45 steel subjected to tempering. The analysis of the influence of heating rate at the kinetic determined from dilatometric curves has been made. There have also been estimated quantities of transformation expansions and thermal expansion coefficients of hardening and tempering structures (austenite, ferrite, pearlite, martensite and sorbite). The analysis of tempering time influence on the hardness of tempered steel has been made. Functions associating hardness with tempering time (rate of heating-up) in technological processes based on short-timed action of a heat source (eg. laser treatment) have been suggested.
Keywords
dilatometric analysis; hardness; tempering; heat treatment; mechanical properties
Hrčak ID:
71162
URI
Publication date:
2.1.2012.
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