The hardness tester presented in the paper is a portable testing equipment for hardness test with static load, for metals and metal alloys, being able to operate both with manual applied load and with applied load through a mobile table of its own frame or through work table of a machine tool, in the latter case hardness tester being mounted on machine head that processes components. In terms of operating principle, hardness tester is based on determination of reaction force of tested material as an expression of its hardness. From constructive point of view hardness tester is presented as a modular form consisting in a probe, which contains spring loading system of indenter, a force sensor, and an electronic unit.

In this article, the authors present the cooling influence in ultrasonic field on the mechanical properties of a dual-phase steel with 0.09% C and 1.90% Mn obtained by intercritical quenching. The heat treatment consisted of heating to 740°C, maintaining for 30 minutes and then cooling in water and water in ultrasonic field. Mechanical properties have been highlighted through universal hardness testing; were determined: Martens hardness (HM), Martens hardness from the slope of the increasing force/indentation depth curve (HM S ), indentation hardness (H IT ), elastic indentation modulus (E IT ), indentation creep (C IT ), elastic (η IT ) and plastic (η plast ) parts of the

The purpose of this study was to investigate the influence of process parameters (current density, temperature and pH) on the mechanical properties of galvanic deposition of nickel with Martens hardness test. Analyzing samples obtained by galvanic deposition process using Martens hardness we could show that there are significant differences between the technological parameters of the deposits made and we could find related to the deposition parameters in order to have a galvanic deposition expected outcomes. In the paper are presented in comparison parameters can be obtained by Martens hardness, such as hardness layer, elasticity modulus E IT , mechanical work of deformation and the ratio of elastic deformation energy and the

The equipment described in the paper consists of a portable optoelectronic structure meant to determine in situ the element chemical composition, metallic material of a welding seam, basic metallic material welded, metallic walls of plasma or gas cutting joint, material welded or cut by laser, some charges of melted steel as well as some other high energy processes accompanied by emission of light electromagnetic radiation, using exactly the high energy radiation in the spectrometer analysis of these heat sources. The device structure and its technical feasibilities are described, too

The aim of this paper consists in studying the migration phenomenon of iron and nickel ions from austenitic stainless steel used in food industry. The study on metallographic structure has shown uniform distribution of the constitutive elements, reducing significantly the possibility for galvanic corrosion phenomenon to occur. The chemical composition of material is determined by EDX-Bruker microprobe. The contact between the metallic material and food product is simulated by using a solution of 3% acetic acid, the samples being kept for different periods of time at the temperature of 100ºC. As a result of the analyses made by atomic absorption spectrometry, some strong dependency between iron and nickel concentrations found in food stimulant, processing degree of surfaces and contact time between the two media has been noticed.