| Autor: |
Briant, C.L, Feng, H., McMahon, C. |
| Zdroj: |
Metallurgical transactions. Part A: Physical Metallurgy & Materials Science; 1978, Vol. 9 Issue 5, p625-633, 9p |
| Abstrakt: |
Temper embrittlement induced by isothermal aging at 480°C (753 K) in a commercially produced heat of HY 130 steel is shown by Auger electron spectroscopy to be due mainly to intergranular segregation of Si, with additional contributions by P, N, and Sn. Studies of rates of crack growth in gaseous hydrogen at controlled temperature and pressure in specimens aged various amounts showed that, as the impurity concentration increased, the stress intensity for crack growth K dropped precipitously, the cracking mode changed from cleavage to intergranular, and the crack growth rate at K > K increased. Hydrogen-induced crack growth occurred in a step-wise, rather than continuous, fashion. The impurity-plus-hydrogen effect is discussed in terms of a model adapted from an earlier theory of Oriani. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
