Behaviour at Nitriding in Fluidized Layer of Austenitic Stainless Steels at the Temperature of 450 °C
Journal Title: Analele Universitatii "Dunarea de Jos" din Galati. Fascicula IX, Metalurgie si Stiinta Materialelor - Year 2007, Vol 30, Issue 1
Abstract
Stainless austenitic steels have a good corrosion resistance but reduced abrasion strength due to low strength below 200HV5. By nitriding one may ensure the obtaining of a superficial layer with increased strength that should maintain unaltered the corrosion resistance. The nitriding in fluidized layer applied at 450 ºC allowed the obtaining of diffusion layers formed of nitrogen enriched austenite with certain nitride separations. For the CrNi, CrNiMo usual steels, the obtained strengths have been higher than 1000 HV005. In the case of steel X1CrNiMoCu20.18.7 with more than 50% of alloying elements, the strengths did not exceed 500 HV005 due to the low nitrogen concentration, much below the saturation limit determined by the reduced diffusion speed. The corrosion test in saline mist indicates the maintaining of corrosion resistance, the materials ranging in the group of Perfectly resistant. Also, the abrasion strength increased 2-3 times due to the limited diffusion speed at low temperature. The favourable property assembly allows the usage of the treatment for some practical applications.
Authors and Affiliations
Ovidiu Dima
Keywords
Related Articles
- EP ID EP662906
- DOI -
- Views 77
- Downloads 0
Management of the Environmental Risks Identified in an Organization
Response to risk is a process that is directly involved in risk management and is governed by the organization's security strategy, environmental characteristics and security mechanisms. The management identifies the opt...
Research on the Influence of Chemical Composition and Structural Condition on the Properties of High-Resistance Naval Steel Flat Rolled Products
The performance achieved in the manufacture of large ships and components of special characteristics requires the use of quality metallic materials with physico-chemical and mechanical characteristics able to satisfy the...
Behavior of 1% Cr Steels at Fluidized Bed Nitrocarburizing
Paper is based by nitrocarburizing experiments made on pilot installation. For experiments were used different samples of steel at different nitrocarburizing regimes. Influence factors were: temperature and ammonia conce...
Granularly Unbind Materials for Casting Composite Moulds
This paper present some partial result based on this idea (of pollution prevention) the domain of making composite-casting moulds (in time of casting, solidifying, and alloy cooling). Casting process impose temporary or...
Researches Regarding the Elements Loss through Vaporization during the Elaboration Process in LD Converter
The paper presents a series of researches regarding the vaporization of the component elements of the metallic bath and slag during refining in LD converter. Also, the main factors which influence the vaporization proces...