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The effect of (γ → α') phase transformation on microstructure and properties of austenitic Cr-Ni steels

Kurc A., Stokłosa Z.

Archives of Materials Science and Engineering

2010

Vol. 41, nr 2

85-94

Purpose: The paper presents the results of the investigations concerning the effect of (γ → α') phase transformation on microstructure, magnetic and mechanical properties of austenitic stainless steel grade X5CrNi18-10. Design/methodology/approach: Light microscope examinations, microhardness measurements and static tensile tests were performed in order to reveal microstructure and changes in mechanical properties. The magnetic properties: relative magnetic permeability μ (Maxwell-Wien bridge) and coercive force Hc (permalloy probe) were measured at room temperature. The analysis of the phase composition was carried out on the basis of X-ray investigations. In the qualitative X-ray analysis the comparative method was applied. Findings: It was found that the plastic deformation in cold rolling within the range 10-70% of investigated austenitic Cr-Ni steel induced in its structure a phase transformation of paramagnetic austenite into ferromagnetic martensite. Research limitations/implications: The results of the X-ray quantitative analysis allowed to determine the proportional part of martensite phases α' in the structure of investigated steel in the examined range of cold plastic deformation. Practical implications: A wide range of practical applications of austenitic X5CrNi18-10 steel sheets is warranted by both their high corrosion resistance and high plastic properties, especially in the supersaturated state. Besides, a strong correlation was found between the magnetic properties and the (γ → α') phase transformation. Originality/value: In the course of deformation, the volume fraction of martensite increased at the expense of the amount of austenite resulting in the hardening of the material. In general, a gradual increase of the yield strength results from the strain hardening of the austenite structure and formation of strain-induced martensite.

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.