What is cavitation erosion? Cavitation erosion is an effect of surface deterioration and surface material loss, mostly in hydraulic machinery and the associated components. Pressure differences in high-velocity liquids can cause vapor or gas pockets, which collapse abruptly on the surface of the material due to the pressure change near the surface. These exploding gas[…]
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Specialist Technologies
Questions and answers concerning cavitation erosion
By Specialist Technologies, Specialty Stainless Steel Processes (S3P) Feb 06, 2018
How can we ensure our 3D printed metal parts are service ready for critical applications?
By Additive Manufacturing, Specialist Technologies Aug 30, 2017
Once a 3D printed metal part is produced, the component is often far from ready to be used for its intended purpose, particularly applications in safety-critical industries with stringent quality standards such as aerospace, medical, energy and automotive. As-built metal parts can contain microstructure defects and material porosity that may be created during the additive[…]
Historically, the first ion implanter was helium based, constructed and operated in 1911 at Cavendish Laboratory in Cambridge by Ernest Rutherford and his students. In 1949, Shockley filed for a patent, “Semiconductor Translating Device” describing the p-n junction fabrication using ion implantation. In 1954, he filed another patent, “Forming of Semiconductor Devices by Ionic Bombardment”[…]
Why is there some degree of porosity in most metal alloy castings?
By Hot Isostatic Pressing, Specialist Technologies Jun 19, 2017
The process by which molten metal freezes in a shaped casting is a complex process. The first metal to freeze at the mold’s surface is typically fine grained and dense due to chilling from the mold surface. As molten metal solidifies, it shrinks. To If sufficient liquid metal is not delivered to the solidification front, pores will form. […]
What is Expanded Austenite or “S-phase”?
By Specialist Technologies, Specialty Stainless Steel Processes (S3P) Jun 18, 2017
The terms “expanded austenite” and “S-phase” were coined when first discovered in the early 1980s. The term S-phase was used to describe new peaks shown with X-ray powder diffraction (XRD) device. It was believed that a new phase was formed in the austenitic structure of stainless steels. It was later discovered this was not true[…]
The frequently asked questions of Kolsterising ®
By Specialist Technologies, Specialty Stainless Steel Processes (S3P) Jun 17, 2017
Kolsterising ®, proprietary to Bodycote, is a technology that greatly improves the mechanical properties of corrosion-resistant materials. Some of the more commonly asked questions from our customers are answered below. Conventional heat treatments, such as nitriding or nitrocarburizing will negatively impact the corrosion resistant properties of stainless steel alloys. Unlike conventional treatments, the Kolsterising ® process can harden the surface and[…]
Galling is a type of mechanical wear caused by a combination of friction and adhesion between sliding surfaces typically under a compressive load. It is the result of tearing and slipping of the crystal structure at the surface once the protective chromium oxide layer has worn away. Further mechanical forces cause the material to become[…]
What is the difference between nitriding and Bodycote’s Corr-I-Dur® process?
By Corr-I-Dur®, Specialist Technologies Jun 08, 2017
Thanks to the wide range of applications, Nitriding and Nitrocarburising processes are becoming more and more important. In addition to mechanical and technological characteristics, corrosion resistance is of vital importance for the functionality of surfaces. The Corr-I-Dur® process not only enhances wear properties, but also significantly improves the corrosion resistance. Corr-I-Dur® has very little effect[…]
How does one achieve optimum results with Corr-I-Dur®?
By Corr-I-Dur®, Specialist Technologies Jun 08, 2017
The achievable surface hardness mainly depends on the base material. Alloying elements such as chrome and aluminium lead to higher hardness. The Nitriding depth depends on customer requirements. Also the component’s condition at delivery, i.e. distortion, heat treatment status also affect the layer parameter to be achieved. Dimensional changes can further be positively influenced by[…]