Abstract
Use of the powder metallurgy (PM) in production of various components has been growing in the automotive industry, including production of sintered stainless steels (SSSs). This study aims to improve the functional properties of SSSs by formation of the Cr3C2-NiCr coating by APS method. The next stage involved alloying of the surface of SSSs using the gas tungsten arc welding (GTAW). Analysis of microstructures was carried out using microscopy (metallographic microscope and scanning electron microscope). Furthermore, the study presents XRD (X-ray powder diffraction) examinations, mechanical properties and surface roughness measurements. The presented modification improved properties of the surface layers examined in the study and enabled a reduction in the wall thickness of the detail, which is important factor in the automotive and transport industry.
Highlights
Due to the wear observed during use, the surface of the solid body has been a subject of the frequent tests
The resulting Cr3C2-NiCr coating is characterized by structural elements that are typical for this deposition method (APS)
Sintered stainless steels are mainly used in the automotive industry, which is open to new material solutions to meet the growing needs and expectations of customers, e.g. in reducing mass of details, especially in electric cars [34]
Summary
Due to the wear observed during use, the surface of the solid body has been a subject of the frequent tests This surface can be repeatedly modified in physical and chemical terms, which results in obtaining the desired functional properties that are better than the properties of the native material [1,2,3]. The surface layer alone plays mostly a technical role It has to show very high requirements for increased durability of consumable machine parts and tools designed and intended for operation in the conditions of friction and fatigue. Duplex steels are increasingly used in the automotive industry for catalyst housing components, turbochargers and rotors [7] They are susceptible to automation of production processes [8]
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