Impact of various heat treatments on the microstructure evolution and mechanical properties of hot forged 18CrNiMo7-6 steel

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Abstract

Carburizing is a method of enhancing the surface properties of components, primarily made from low to medium carbon steels, such as shafts, gears, bearings, etc. Carburized parts are generally quenched and tempered before being put into service; however, after quenching of carburized parts further annealing and hardening treatments can be employed before final tempering. This work analyses the impact of the two aforementioned heat treatment approaches on the development of subsequent microstructures and mechanical properties of hot forged 18CrNiMo7-6 steel. Moreover, this study aims to understand the impact of normalizing treatments prior to the two aforementioned heat treatment routes. Microstructural and mechanical tests were conducted on four as forged flat cylinder components that received a combination of the abovementioned heat treatments. In general, better microstructure refinement, in terms of prior austenite grain size (PAGS), was obtained for carburized parts that received the intermediate annealing and hardening treatments after quenching and prior to the final tempering. Additionally, further refinement of the martensitic pockets/blocks was observed for parts that did not receive a normalising treatment prior to carburisation. The studied heat treatments appear to have a negligible effect on the mechanical properties of the hot forged flat cylinder components.
Original languageEnglish
Pages48-53
Number of pages6
Publication statusPublished - 24 Oct 2017
EventHeat Treat 2017: 29th Heat Treating Society Conference and Exposition - Ohio, United States
Duration: 24 Oct 201726 Oct 2017
http://www.asminternational.org/web/heat-treat-2017

Conference

ConferenceHeat Treat 2017
CountryUnited States
CityOhio
Period24/10/1726/10/17
Internet address

Keywords

  • carburizing
  • heat treatment
  • 18CrNiMo7-6 steel

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