ThermoMechanical Treatment Effects on Stress (形变热处理对应力的影响).pdf
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Thermo-Mechanical Treatment Effects on Stress Relaxation and Hydrogen
Embrittlement of Cold-Drawn Eutectoid Steels
L. Caballero*, J. M. Atienza, and M. Elices
Dpto . de Ciencia de Materiales , CISDEM , Univ . Politécnica Madrid .
Prof. Aranguren s/n, 28040 Madrid , Spain .
The effects of the temperature and stretching levels used in the stress-relieving treatment of cold-drawn eutectoid
steel wires are evaluated with the aim of improving the stress relaxation behavior and the resistance to hydrogen
embrittlement. Five industrial treatments are studied, combining three temperatures (330, 400, and 460 °C)
and three stretching levels (38, 50 and 64% of the rupture load). The change of the residual stress produced
by the treatments is taken into consideration to account for the results. Surface residual stresses allow us
to explain the time to failure in standard hydrogen embrittlement tests.
Keywords: metals, eutectoid steel wires, thermomechanical processing, mechanical properties, tensile test
1. INTRODUCTIO N increase, and a third stage for higher temperatures with a
decrease of both mechanical properties, though accompa-
Appropriate composition and thermal treatment provide nied by a better ductility. Recovery and recrystallization of
the fine pearlitic microstructure necessary to produce wires the cold worked structure happen at temperatures of 400 °C
for prestressing concr
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