The Nitrocarburising Response of Low Temperature Bainite Steel

Abstract

The nitrocarburising response of low transformation temperature ultrafine and nanoscale bainitic steel was investigated and compared with martensite and pearlite from the same steel composition. It was found that the retained austenite content of the bainitic steel dictated the core hardness after nitrocarburising. The refined bainitic structure showed improvements in the nitriding depth and hardness of the nitrocarburised layer, compared to coarser grained martensitic and pearlitic structures, possibly due to the fine structure and the distribution of nitride forming elements.

Bainite and Martensite: Developments and Challenges

“…The present Special Issue includes one review paper [1], one technical note [2] and ten scientific papers [3][4][5][6][7][8][9][10][11][12]. In all of them, martensite and/or bainite are being studied and in some cases, in combination with other phases.…”

“…Development of new steel grades for specific industrial products and existing processing routes [11]. The response of martensitic and bainitic microstructures to more traditional treatments as nitrocarburising [9] or tempering [2,3,5] based on the initial microstructural characteristics. More fundamental studies on the ways and means of phase transformation in specifically designed alloys [6,8,12] and the mechanical response and relationships between microstructure and mechanical properties [2,7,10] are among the topics presented in this compendium.…”

The Microstructure and Properties of Carbon Thin Films on Nanobainitic Steel

“…Attempts to combine nanobainitization with surface engineering treatments were focused mainly on nanobainitization of carburized low-carbon steels [20][21][22] or nitrocarburizing of specially designed nanobainitic steel. [23] Therefore, it is crucial to investigate whether it is possible to produce a high adhesive carbon coating by applying low-temperature RFCVD and glow discharge p on commercial X37CrMoV5-1 steel after nanostructurization, with and without a nitrided sublayer, at a temperature lower than the thermal stability of the nanocrystalline microstructure. An additional goal was to check how the sublayer influences the adhesion and properties of the top layer.…”

The Corrosion and Wear Behaviors of a Medium-Carbon Bainitic Steel Treated by Boro-Austempering Process

“…The third method is to utilize deformation processing [14,15]. However, there are few studies attempting to enhance the surface properties of bainitic steels [16][17][18], which provides another effective way to tailor the properties and expand the application range of high-strength bainitic steels. Fabijanic et al [16] produced the nitrocarburised layer on high-carbon bainitic steels by nitrocarburising treatment after finishing the bainitic reaction.…”