Abstract
Effect of hydrogen-charging and strain rate was investigated on the tensile properties of a ductile cast iron having the microstructure comprised of ferrite/pearlite matrix and spheroidal graphites. Hydrogen-charging accelerated the process of crack growth from graphite. The crack growth acceleration resulted in a marked decrease in reduction of area at final fracture (RA). In the uncharged specimens RA was nearly constant with strain rate, whereas in the hydrogen-charged specimens RA was gradually decreased with a decrease in strain rate. Thermal desorption spectroscopy and hydrogen microprint technique revealed that in the hydrogen-charged specimen most of solute hydrogen was diffusive and mainly segregated at graphite, graphite/matrix interface zone and pearlite. Considering all the obtained results together, the hydrogen-induced degradation was attributed to a combination of the following three factors: (i) hydrogen supply to the crack tip from the graphite/matrix interface zone, (ii) hydrogen-enhanced pearlite cracking and (iii) successive hydrogen emission from the graphite and additional supply to the crack tip.
| Original language | English |
|---|---|
| Title of host publication | Supplemental Proceedings |
| Subtitle of host publication | General Paper Selections |
| Publisher | John Wiley and Sons Inc. |
| Pages | 447-454 |
| Number of pages | 8 |
| Volume | 3 |
| ISBN (Electronic) | 9781118062173 |
| ISBN (Print) | 9781118029473 |
| DOIs | |
| Publication status | Published - May 3 2011 |
| Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Engineering(all)
- Materials Science(all)