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1 2009

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The effect of the cold rolling on the structure and mechanical properties in austenitic steels type 18-8

Ozgowicz W., Kurc A.

Archives of Materials Science and Engineering

2009

Vol. 38, nr 1

26-33

Purpose: In this paper the effect of the cold rolling on the transformation of austenitic stainless steel type X5CrNi18-10 to martensite was studied as a function of rolling reduction. Design/methodology/approach: The investigations included observations of the structure on a light microscope, researches of mechanical properties in a static tensile test and microhardness measurements made by Vickers�fs method. The analysis of the phase composition was carried out on the basis of X-ray researches. In the qualitative X-ray analysis the comparative method was applied, whereas X-ray quantitative phase analysis was carried out by the Averbach Cohen method. Findings: Plastic deformation in a cold rolling of investigated austenitic stainless steel induced in its structure martensitic transformation �Á �¨ �ż�f. Research limitations/implications: The X-ray phase analysis in particular permitted to disclose and identify the main phases on the structure of the investigated steel after its deformation within the range 10%�€70%. Moreover, the results of the X-ray quantitative analysis allowed to determine the proportional part of martensite phases �ż` in the structure of investigated steel in the examined range of cold plastic deformation. Practical implications: The analysis of the obtained results permits to state that the degree of deformation has a significant influence on the structure and mechanical properties of the investigated steels. Besides, a good correlation was found between changes of the structure and the effects of investigations of the mechanical properties. Originality/value: Revealing the analytic dependence of the yield point of the Cr-Ni steel on the degree of deformation in cold working has essential practical importance for the technology of sheetmetal forming of the analyzed steel.