Researching The Properties Of Material On The Stainless Steel Vehicle Body

Both 301L and 304 austenitic stainless steels are metastable alloys, and when the nickel equivalent content is less than 22% and Md temperature is higher than room temperature, tensile deformation of the alloy under room temperature will induce martensitic phase transformation, which causes the alloy to undergo macromechanic changes. Focusing on the production and the application of the main material of railway vehicle stainless steel light body—301L cold-rolled reinforced sheet, the paper studies the effects of nickel, carbon and nitrogen contents on the transformation of the 301L cold-rolled sheet through the tension experiments on French EN.4318(E10088-1 European standard 301L), Japanese SUS301L(JIS G4305 Japanese standard301) as well as trail-produced domestic 301L cold-rolled sheet, aiming at optimizing the contents of the domestic sheet and improving the performance of the domestic sheet. In addition, the paper studies the effects of prestrain and strain rate on the transformations of EN.4318 and French EN1.4301(304)sheets. With the analysis implements of SEM, XRD, optical metaloscope and magnetic saturation instrument, the paper studies the induced martensitic phase transformations of French, Japanese as well as domestic 301L cold-rolled sheets resulted from tensile deformations and analyses the effects of the induced martensitic phase transformation on the intensity and the plasticity of 301L and 304 sheets. The paper also studies the fatigue behaviors of French and domestic 301L cold-rolled sheets. The results of the paper are of reference value and practical significance to the production and the application of domestic cold-rolled austenitic stainless steel sheetsThe carbon and nitrogen content of French 301L sheet is lower than that of Japanese sheet. The nickel content is minimum of 6.62 percent, which is lower than Japanese sheet. The carbon of domestic sheet is highest, which the nickel and nitrogen are similar to the Japanese sheet. The stability of French 301L austenitic is lowest, and the domestic sheet is highest. Three kinds of 301L cold-rolled sheet in the course of tensile deformation, martensile changing French 301L cold-rolled sheet is fastest and the work-hardening rate is highest. The martensile changing of domestic sheet is slowest, and the work-hardening rate is lowest, but the elongation is greatest.The stability of French 301L cold-rolled stainless steel is low, which get the higher yield strength and lower biggest flow stress. The stability of 304 cold-rolled stainless steel is high, which get the higher yield strength and higher biggest flow stress. The gap of flow stress betwin French 301L cold-rolled sheet and annealed sheet is large, and the gap of flow stress betwin French 304 cold-rolled sheet and annealed sheet is small, which indicate that increasing the nickey content can reduce the speed of martensite transformation in the course of austenitic stainless steel deformation.,thereby reducing the of deformation behavior and to increase the rate of extension.The S-N curve of French and domestic 301L cold-rolled go along with the load increasing, the fatigue life showed a downward trend, but the trend of demostic sheet drop more rapidly. The fatigue limit of French sheet is higher than that of domestic sheet, which indicate that decrease the nickey content, while reduce the extension rate of the base metal, but donn't reduce the fatigue.French 301L cold-rolled decrease the nickey contene,replacing carbon with nitrogen,and add a small amount of copper and molybdenum, guaranteesing its yield strength and fatigue strength,saving the cost of manufacturing ,which can refer as developing pattern for the demostic 301L cold-rolled sheet.