Description
Research mentioned in the Project are concerned with new grades of TRIP steel use for drawing products. First goal of the Project will be to carry out a detailed analysis of the effect of variable stresses, smaller than R0,2, on the intensity of transformation of retained austenite into martensite. Second goal of the Project will be to carry out studies to determine the possibility of running the TRIP steel wire process in a "hot" manner, i.e. at a temperature close of Md, which would block the transformation of the retained austenite contained in the structure into martensite. Achieving the scientific goals set in the project will bring about a novelty in the knowledge of the subject and enable a comprehensive analysis of the research problem of the effect of individual factors on the transformation of retained austenite into martensite in drawing processes. This will open wide possibilities for searching for new areas for both drawing technology and the application of this type of material to innovative wire and rod products of unprecedented properties. It will also establish the position of the PI as one of the few specialists in this discipline of knowledge in the world.
Summary of project results
The investigation results have a practical import, because, e.g., fasteners made of TRIP steel, exposed to variable stresses in sen/ice, may undergo additional strain hardening to a varying extent, which will affect their mechanical properties, service life and working safety. As a result of warm drawing tests carried out, the temperaturę at which the inhibition of retained austenite transition is observed has been determined to be 4505C. So performed drawing process enabled end-diameter wires to be obtained, which, regardless of considerable strain hardening, had a sufficiently large quantity of retained austenite in their structure, which would allow the TRIP effect to be utilized in the finished product. The influence of the applied partial reductions scheme on the change in offset yield strength and, consequently, the improvement ofthe plastic properties has been found. In view of the above, the both project objectives have been achieved by determining the effect of the variation in stress state and temperaturę on the properties of finished wires. Based on the research results, we are able to obtain new products that are distinguished by high mechanical properties and adequately high ductility. The research will, therefore, provide a basis for the submittal of further applications within research programmes which will result in the implementation of a new technology or product. In addition to the scientific aspect, the implementation ofthe project has largely contributed to the widening ofthe Project lnvestigator's publication achievements and enabled her to gain experience in managing a research team taking part in carrying out tasks.
Summary of bilateral results