Effect of increased nitrogen content on the structure and properties of tool steels

• Autorzy: Cieśla M. , Ducki K. J.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The influence is analysed of an increased nitrogen content in the range of 0.03-0.09% on stereological features of the microstructure, the principal mechanical properties, crack resistance and fatigue strength of alloy tool steels of X155CrMoV12-1 and X40CrMoV5-1 types, and the HS 6-5-2 high-speed steel. Design/methodology/approach: The principal stereological parameters of precipitates in the microstructure of as-annealed, quenched and tempered tool steels with nitrogen have been determined. The surface fraction and the mean plane section area of carbides have been determined as well. The influence of nitrogen on abrasion resistance, crack resistance and low-cycle fatigue of a heat improved steel has been examined. Findings: It has been found that in the investigated tool and high-speed steels, a nitrogen addition enhances size-reduction and homogenization of the structure in the as-quenched and as-tempered condition. Moreover, an advantageous effect of nitrogen additions has been found on increasing the fraction and dispersion of carbides in the as-annealed condition. The tool and high-speed steels with a nitrogen addition have shown increased resistance to abrasion and brittle cracking as well as longer fatigue life at an elevated temperature. Practical implications: At the laboratory testing stage, the results of the study may constitute an assessment of the effect of nitrogen addition on usable properties of tool steels. The results should be used to develop a production technology of tool steels containing nitrogen of increased durability in operational conditions. Originality/value: The study has shown the influence of a nitrogen addition in the range of 0.03-0.09% on the modification of the microstructe of selected tool and high-speed steels, which determines the enhanced usable properties of those steels.

Słowa kluczowe

EN

tool materials; quantitative metallography; crack resistance; fatigue

PL

materiały narzędziowe; metalografia ilościowa; odporność na pękanie; zmęczenie materiału

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2008
• Tom: Vol. 29, nr 1
• Strony: 15--22
• Opis fizyczny: Bibliogr. 23 poz., il., tab., wykr.

Twórcy

autor

Cieśla M.

autor

Ducki K. J.

• Materials Science Department, Silesian University of Technology, ul. Krasińskiego 8, 40-019 Katowice, Poland,

Bibliografia

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