Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Gas nitrided layers on precipitation hardened stainless steel

nr katalogowy: 52676

This paper presents research results of nitrided layers on Sandvik NanoflexTM stainless steel, known also as 1RK91, which belongs to precipitation-hardening stainless steel group. This is an ultra highstrength material with a combined excellent corrosion resistance. By a simple heat treatment after cold deformation, extremely high tensile strength levels (2000 MPa and 3000 MPa for wire) in combination with a good toughness (up to ca. 600 HV) could be obtained. Achievement of such good mechanical properties is caused thanks to very fine, submicroscopic precipitations as: Cu, Fe2Mo, ƞ-Ni3(Ti, Al), R-phase, described in several publications [1÷7]. Due to its special properties, this steel is suitable to manufacturing very responsible surgical tools. Heat treatment of the steel consists of two steps, i.e. solutioning (ca. 1050÷1100°C), and precipitation hardening by ageing at temperature typically 475°C for 4 hours. This range of hardening temperature overlaps with temperature of nitriding process, therefore thermo-chemical and heat treatment could be conducted simultaneously under condition of sufficient corrosion resistance of the layers manufactured at this temperature. Although limited studies have been conducted to investigate the plasma and gaseous nitriding response of 17-4 PH stainless steels [8÷12], very little work has been done concerning the nitriding behaviour of Nanoflex steel [13, 14]. Sun and Bell have studied layers obtained on 17-4 PH with the plasma nitriding at temperatures between 350 and 450°C [7]. They observed in layers nitrided at temperatures lower than 425°C “white" and featureless morphology after etching. The resultant XRD patterns for these layers are typical of an amorphous like structure, without any distinct reflection peaks. Frandsen with others [14] successfully nitrided Nanoflex steel using gaseous process at temperature below 425°C for long duration time (16÷20.5 h). Obtained by them [...]

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