Abstract
By the OM, SEM, TEM, and EBSD, the microstructures of cool-drawing austenitic stainless steel wires used for metal rubber were studied. The results showed that the microstructures of this steel wires were made up of α martensite phase, presenting twin and dislocation substructures, and residual austenite phase which was refined into micron dimension. The results also presented that there were so many Shuttle-shaped micro holes in this steel wires, lugging along drawing axis and cored by the hard particles second-phase. The further investigation indicates that the Cr17-Ni7 cool-drawing austenitic stainless steel wires were more applicable to use for the high-damp metal rubber. All kinds of metal rubber elements have a spatial mesh structure , similar with the rubber polymer structure , which is crossed and hooked together by a metal wire. The structure has rubber elasticity while maintaining the metal excellent properties. It has a very broad application prospects of the metal rubber to be used in aerospace, defense, machinery, transportation and to made into the member in special conditions of damping, shock protection, filtration, sealing and heat conduction. Now 18-8 austenitic stainless steel is the most used in the metal wire rubber member. Its microstructure has a significant impact for components performance. 18-8 series austenitic stainless steel is a very mature grades and is understood deep. At the same time it is also reported in the literature for deformation induced martensite transformation caused by large deformation of this type of austenitic stainless steel in the rolling process. However, metal rubber elements with Φ0.1 ~ 0.5mm is drew by stainless steel wire system. Organizational changes triggered by drawing, especially the organization study of a scanning electron microscopy is still rare. Therefore, further study of the microstructure of cold-drawn state 0Cr18Ni9Ti stainless steel wire is necessary. In addition, the work in this paper made instructive recommendations for the choice of metal rubber components using in stainless steel wire materials. 1 Experimental materials and methods The diameter metal rubber stainless steel wire generally take Φ0.1 ~ 0.5mm, and it has confirmed that the species of Martensitic transformation of stainless steel wire are closely related to cold deformation. For convenience considerations of TEM experimental sample preparation, the 0Cr18Ni9Ti stainless steel wire of diameter Φ14mm and the finished with diameterΦ6mm by cold drawing as the research object, the rate of reduction of the is 83.67 percent and elongation of drawing for the last time is about 35%, which has reached the stage of deformation fully induced transformation. The optical microscopy, scanning electron microscopy and transmission electron microscopy, EBSD observation experiment are taken for vertical and horizontal cross-section. A comprehensive analysis is taken of mechanism of strain-induced martensitic transformation and the sub-structure of martensite while 0Cr18Ni9Ti steel cold drawing.
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