AI Article Synopsis
- Components intended for nitriding undergo a pre-heat treatment to enhance core strength, with the potential for better service characteristics when optimized.* -
- The study explored optimizations for two steel types (EN31CrMoV9 and EN42CrMo4), including increasing the austenitization temperature for finer carbide distribution, resulting in higher hardness.* -
- Another approach involved using a bainitic treatment instead of traditional quenching and tempering, which improved diffusion depth and core hardness, although some hardness was lost during subsequent nitriding.*
Article Abstract
To achieve a core strength that meets the requirements during service life, components to be nitrided are subjected to a pre-heat treatment. Since a higher strength prior to nitriding also has a positive effect on the achievable strength in the nitrided layer, an optimization of the pre-heat treatment may lead to better service characteristics of nitrided components. For this purpose, different optimizations of pre-heat treatment were investigated on the nitriding and quenching and tempering steels EN31CrMoV9 and EN42CrMo4 (AISI4140). One strategy was a change of the austenitization temperature for EN31CrMoV9 from 870 °C to 950 °C in order to solve the coarse carbides of the as-delivered state and realize a finer distribution of the carbides in the quenched and tempered structure. This special treatment lead to a higher hardness compared to the conventional treatment. The second investigated pre-heat treatment variant was a bainitic treatment instead of quenching and tempering. The bainitic initial microstructure increased the diffusion depth compared to conventionally quenched and tempered specimens. In addition the maximum hardness of the nitrided layer, the core hardness was significantly higher on the specimens with the bainitic microstructure. During subsequent nitriding, however, the bainite is tempered and loses some of its hardness.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8704897 | PMC |
| http://dx.doi.org/10.3390/ma14247766 | DOI Listing |
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