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Wybrane aspekty odkształcenia plastycznego na zimno stali AISI 304

Kurc-Lisiecka A.

Stal, Metale & Nowe Technologie

2017

nr 5-6

14--21

Celem badań była analiza wybranych technicznych i strukturalnych aspektów odkształcenia plastycznego na zimno w procesie walcowania blach ze stali AISI 304. Metodyka badawcza obejmowała obserwacje struktury na mikroskopie świetlnym, badania własności mechanicznych określone w statycznej próbie rozciągania i pomiary twardości. Analizę składu fazowego przeprowadzono na podstawie badań rentgenograficznych. Potwierdzono analityczną zależność granicy plastyczności badanej stali od stopnia gniotu w procesie walcowania, co ma istotne znaczenie praktyczne dla tej technologii wytwarzania blach cienkich ze stali austenitycznej. Przeprowadzone badania metalograficzne i rentgenowska analiza fazowa wykazały, że w walcowanej na zimno stali austenitycznej przy większych stopniach gniotu zachodzi bezpośrednia przemiana fazowa (γĺα’).

The aim of the study was to analyze the chosen technical and structural aspects of cold deformation in the rolling process of the AISI 304 steel sheets. The investigations included observations of the microstructure on a light microscope, a study of mechanical properties during static tensile tests and hardness measurements. The analysis of the phase composition was carried out by means of an X-ray diffractometer. It was found that the value of the AISI 304 steel’s tensile strength, yield point and hardness increase as the degree of its deformation increases, but simultaneously the value of elongation decreases. The analytic dependence of the yield point of the investigated steel on the deformation degree under cold rolling pressing process has been confirmed. The determination of this relation is crucial for the technology and precise shaping the properties of the sheet metal of austenitic steel under the production stage. The conducted metallographic investigations and X-ray phase analysis show that the plastic deformation under the cold working of austenitic steel AISI 304 induces the direct phase transformation (γĺα’) in its structure.

Some mechanical and magnetic properties of cold rolled X5CrNi18-8 stainless steel

Kurc A., Stokłosa Z.

Archives of Materials Science and Engineering

2008

Vol. 34, nr 2

89-94

Purpose: The paper analyzes the influence of the degree of cold deformation on the structure forming and changes of mechanical and magnetic properties of cold-rolled sheet on austenitic X5CrNi18-8 stainless steel. Design/methodology/approach: The investigations included observations of the structure on a light microscope, researches of mechanical properties in a static tensile test, microhardness measurements made by Vickers's method and magnetic behaviors determine by used normalized non-destructive testing methods (NDT). 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. 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 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: The analysis of the obtained results permits to state that the degree of deformation has a significant influence on the structure, mechanical and magnetic properties of the investigated steel. Besides, it was found that the plastic deformation in cold rolling process of metastable austenitic steel type X5CrNi18-8 induces in its structure a phase transformation paramagnetic austenite into ferromagnetic martensite. Originality/value: plastic deformation in cold rolling process in the austenitic X5CrNi18-8 stainless steel a good correlation was found between changes of the structure and the effects of investigations of the mechanical properties, connected with martensitic α' phases forming. Existing this relation is of essential practical importance for the technology of sheet-metal rolling of austenitic steel.