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New post forging treatment of medium carbon microalloyed steels
Author(s) -
Kaspar Radko,
GonzälezBaquet Ignacio,
Richter Johannes,
Nußbaum Georg,
Köthe Alfred
Publication year - 1997
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199701788
Subject(s) - forging , materials science , metallurgy , vanadium , martensite , tempering , toughness , microalloyed steel , annealing (glass) , ferrite (magnet) , microstructure , titanium , austenite , composite material
In drop forging of parts for the transport industry the classical quench and tempering (QT) of alloyed steels is nowadays substituted by direct continuous cooling (CC) of microalloyed steels with elimination of quench cracking and expensive straightening and stress relieving cycles. Nevertheless, there are some limitations on strength and toughness achievable by this technique. On two commercial medium carbon (0.3%C) steels microalloyed with vanadium or vanadium and titanium, modified forging parameters and a new two‐step cooling (TSC) strategy combined with an additional annealing were applied. Some increase in manufacturing costs, when compared to CC, can be justified by a significant increase in strength and ductility. The improvements attainable through such a modified treatment give evidence of the large potential of multi‐phase ferrite‐containing microstructures as a substitute of a tempered martensite.