Search Results for Vickers indentation hardness

This article reviews the measurement physics of macro and micro Vickers indentation testing and the factors that determine measurement precision and repeatability. Study results show that when force loads of less than 100 gf are used, it is difficult for operators to precisely determine the position of the indenter tip, leading to various measurement errors. These errors explain the data anomalies reported in the literature for low-load Vickers hardness testing, which are often incorrectly attributed to material characteristics.

From its earliest beginnings to today, hardness testing has evolved in a parallel manner to the engineering innovations of the times.

This article series explores the indispensable role of characterization in the development of cold spray coatings and illustrates some of the common processes used during coating development.

This article describes sample preparation to create a visually impressive micrograph image of single-phase cartridge brass, C26000, an alloy composition of 70% copper and 30% zinc. C26000 was chosen due to the striking twins and large grain size that are easily generated by annealing a cold-worked sample, the large range of contrast and colors that can be created by etching, and the wide availability of the material. This entry won the Jacquet-Lucas Award for Best in Show at the 2021 International Metallographic Contest.

In recognition of ASM International's 100-year anniversary , AM&P highlights historic events and technological advancements that occurred over the course of those years. This issue extends the timeline from 1924 to 1933, which includes the invention of 18-8 (type 304) stainless steel, the development of the Vickers hardness test, the debut of tungsten carbide cutting tools, and the first all-metal single-wing aircraft to transport mail.

Powder metallurgy offers distinct advantages for the production of certain alloys. The degree to which contents of the alloy may be prescribed represents tremendous potential and supports alloy use in new applications. However, robust testing of powder metallurgy alloys is required to assess their potential and quality. Fatigue testing via the resonance principle enables metallurgists to achieve greater throughput in testing programs, while novel hardness testing platforms support analysis of individual phases in porous powder metallurgy specimens.

In this study, 316L stainless steel samples were plasma nitrided for 64 h at 370-420 °C then subjected to surface hardness and pitting corrosion testing. The results show that interstitial hardening with nitrogen significantly improved the surface hardness as well as the pitting corrosion resistance of the austenitic stainless steel.

Vacuum solution nitriding is a promising technique for increasing the surface hardness, load-bearing capability, and fatigue strength of martensitic stainless steels without sacrificing corrosion resistance. This article examines the effects of nitriding pressure and temperature on surface nitrogen content and case depth in four martensitic stainless steels.