Preparation of carbide isolates of new high-speed steel for analysis by atomic absorption spectrometry

Abstract

Abstract. The paper presents results of the investigation of a new high-speed steel's (HSS) carbide isolates, using atomic absorption spectroscopy (AAS). Because of the presence of metallic residues, two stage preparation of isolates was applied: electrolytic winning of the carbide isolates, followed by additional treatment with phosphoric acid. The chemical compositions so obtained were of enhanced accuracy and served as input data for computing the matrix's chemical composition. This indirect approach reduced the errors connected with the phases mutual contribution, such as occur in the case of HSSs and steels of similar multi-phase microstructure when bulk specimens are investigated with energy dispersive XRE The extent of the carbides' dissolution in the matrix and hence the matrix's saturation during hardening, as well as the character of secondary precipitation while tempering, were assessed. These findings are of importance in respect of both phenomena during heat treatment and the investigated steel's properties.

Dissolution of Carbide Isolates in Acids Using Microwave Technique

“…For their dissolution the following mixture of acids was used: 10 mL HCl + 5 mL HNO 3 + 3 mL HF in teflon decomposition beaker. A complex analytic diagram for determining the chemical elements was presented in paper [4]. The method and conditions of dissolution of those isolates were chosen in such a way so that the achieved solutions could be analysed with the atomic absorption spectroscopy -AAS method, determining in them the content of the following elements: Cr, Mo, Ti, Nb, Zr, W, V and Fe.…”

“…It refers both to the already produced materials and to designing new highalloyed steels and alloys of metals which are meant for specific applications. An important role from the point of view of structure and properties of materials is played by carbide phases [1][2][3][4]. In order to determine their chemical composition various methods are applied, i.e.…”