ISSN:
1573-885X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions 1. A structural criterion of cracking resistance for structural steels has been proposed. The crystalline boundaries of these steels weaken during service in hydrogen charging, precipitation of second phase particles, and segregation of harmful impurities at the crystallite (grain) boundaries. The criterion is based on evaluating the characteristic distance on the basis of the results of fractographic determination of the proportion of transcrystalline cleavage, brittle intercrystalline, and dimpled failure within the limits of the zone of stable crack growth. 2. The results obtained for the low-alloy structural steels with ∼0.2% C and ∼0.4% C, and 10Kh2GNM steel subjected to hydrogen charging and thermal embrittlement, respectively, causing weakening of the crystalline boundaries show that the values of the fraction of intercrystalline failure fm (10–80%) are closely linked over a wide range with the values of KIscc and KIc since KIscc ∼ (1−fm)1/2 and KIc ∼ (1−fm)1/2. 3. For cases of brittle and quasibrittle failure of the bolt steels with ∼0.2% C and ∼0.4% C, tested for SCC in a medium with pH 2.2 we detected a close link of parameter KIscc with the ratio [(1−fm)/(1−fdi)]1/2, where fm and fdi are proportions of intercrystalline dimpled failure, respectively.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00723626
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