Abstract
Surface improvement in steels is of great interest for applications in industry. The aim of this investigation is to study the effect of nitrogen ion implantation on the axial fatigue strength and wear resistance of 15-5 PH stainless steel. It is well know that electroplated coatings, which are used to improve abrasive wear and corrosion properties, affects negatively the fatigue strength. It is also important to consider requirements to reduce the use of coated materials with electroplated chromium and cadmium, that produce waste, which is harmful to health and environment. The HVOF (High velocity oxygen fuel) process provides hardness, wear strength and higher fatigue resistance in comparison to electroplated chromium. Plasma immersion ion implantation has been used to enhance the hardness, wear, fatigue and corrosion properties of metals and alloys. In the present research the fatigue life increased twice for 15-5 PH three hours PIII treated in comparison to base material. From the abrasive wear tests a lower pin mass reduction was observed, associated to the superficial treatments. The improvement of fatigue and mechanical performance is attributed to a combination of nitrides phase structure and compressive residual stresses during the PIII treatment.
Highlights
Surface treatments in mechanical components are considered necessary to improve wear and corrosion properties of applied materials
It is well known that wear and corrosion processes on aircraft structures are controlled by electroplated chromium and cadmium, hard anodizing and, more recently, HVOF thermal spray coatings [1,2,3]
2.5 Abrasive wear test Dry sliding wear tests were performed on 15-5PH/aluminum-bronze 630 tribological pair, using a pin-on-disk equipment according to ASTM G99 standard
Summary
Surface treatments in mechanical components are considered necessary to improve wear and corrosion properties of applied materials. The plasma immersion ion implantation and deposition (PIII D) technique was responsible for the good adhesion strength between the nitrogen doped diamond-like carbon (N-DLC) coating and NiTi substrate. The effect of temperature on the surface mechanical properties of H13 steel implanted with nitrogen ions using plasma immersion ion implantation was to improve hardness and wear resistance by increasing the PIII treatment. Experiments performed with AISI 304 stainless steel treated by plasma immersion ion implantation showed that high nitrogen concentration and/or thicker layers improved hardness and wear resistance, whereas simultaneously reduced the surface fatigue strength [12]. Improvement in the mechanical behavior and in the rolling contact fatigue strength of nitrogen PIII treated AISI 52100 bearing steel was attributed to a combination of nitrides phase structure and compressive residual stresses during the process [13].
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