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Creep‐rupture strength of a martensitic chromium steel after annealing between 750 and 950 °C
Author(s) -
Schäfer Ludwig
Publication year - 1994
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199400950
Subject(s) - creep , martensite , metallurgy , austenite , chromium , annealing (glass) , materials science , pearlite , composite material , microstructure
The influence of various temperature transients on the tirne‐to‐rupture of a martensitic chromium steel was investigated in tests in which the transient temperature and transient time, cooling rate, and test temperature were varied systematically. Above a temperature of approximately 800 °C an austenitic structure is produced which can be transformed back into martensite by rapid cooling to a temperature below approximately 200 °C. The time‐to‐rupture of this martensite may be reduced by a factor of five compared to the initial condition. At annealing temperatures below 780 °C (A c1b ) this loss in time‐to‐rupture is either less pronounced or non‐existent. If austenite produced above some 800 °C is cooled slowly, pearlite of very low creep‐rupture strength is generated, or the austenite remains in existence above 300 °C and, depending on the test temperature, also may have an unsatisfactory creep‐rupture strength.