Journal article
Thermal fatigue evaluation of AISI H13 steels surface modified by gas nitriding with pre- and post-shot peening
In this work, the H13 hot work die steels were surface modified and experimentally evaluated in a homemade thermal fatigue simulation tester. Two types of nitrided compound layers, and compound-free layers with and without surface deformation were prepared by a selection of surface modifications including traditional gas nitriding, controlled gas nitriding, gas nitriding with pre-shot peening, and controlled gas nitriding with post-shot peening.
Thermal cracks formed in the nitrided compound layer propagated faster on surface but slower along the depth direction as compared to those in the compound-free layer. Thermal crack advancing along the depth direction in the sample nitrided with pre-shot peening had a tendency to be suppressed by the higher cross-sectional hardness distribution.
The deformed compound-free nitrided layer showed the excellent thermal fatigue cracking resistance in both surface and cross-section, which was attributed to the good combination of hardness and toughness, as well as the underlying enhanced compressive residual stress.
Language: | English |
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Year: | 2019 |
Pages: | 45-51 |
ISSN: | 18735584 and 01694332 |
Types: | Journal article |
DOI: | 10.1016/j.apsusc.2019.03.291 |
ORCIDs: | Wang, Bo and 0000-0003-4669-4821 |