Study On Grain Refinement For 09CuPTiRE Steel

Steel is an extremely important material. As the national economy develops, the number and performance of steel materials have set higher requirements. Currently, the yield strength level of carbon structural steel is 200MPa grade, that of high-intensity low-alloy steel is 400MPa grade, and tensile strength of alloy structural steel is 800 MPa grade. In order to meet future economic and social development needs, the need for research and development of a new generation of high-intensity and long-life steel. Against this background a new generation of steel materials "super steel". The basic ideas of super steel development are: through high-cleansing, homogeneous, and ceramic crystal to significantly increase the performance of steel. The traditional methods steel materials for micro organizational strengthening are : use of point faults in steel for strengthening it by producing solid solution enhancement, use of line faults in steel for strengthening it by producing dislocation enhancement, use of face faults in steel for stopping the move of dislocation and use of space faults by producing precipitation. Grain refinement is the only way to enhance the resilience of metal materials intensity without sacrificing. Currently, the consistent ways of the ceramic grain refinement of steel are: Microalloying Processing, Electromagetic Processing, Thermo-Mechanical Processing (TMP), Microalloying.The study uses Deformation Induced Ferrite Transformation (DIFT) with materials to trace elements of Nb in 09CuPTiRE steel grain refinement role, and the strengthening of steel, and the effect of grain storage energy to growing of nuclei, and in the context of strengthening the role of the certification test data . 09CuPTiRE steel is used in the production of rail vehicles, tensile strength of 390MPa class 09CuPTiRE steel varieties of corrosion resistant steel. Compared to Q235 steel , their relative corresion resistant rate is 233% higher, but their strength level is basically the same levels as a Q235 steel . The study confirmed as a micro-alloy element Nb of elements joined 09CuPTiRE steel, detailed and sedimentation through crystal grain steel reinforcing effects of the organization and performance, thereby increasing its intensity. To explore and certificate in 09CuPTiRE Nb added element of steel DIFT craft detailed 09CuPTiRE steel possibilities, a two-stage test was worked out.Through two stages of the insertion of micro-Nb and steel rolling specimen Nb 09CuPTiRE Mechanics performance comparison analysis found Nb can really effective refine 09CuPTIRE steel grain, and raising the effective performance of itstensile yield strength at the same time but does not diminish its toughness. Nb addition in steel can contribute to the achievement of transformation of austenite to ferrite in steel, Nb elements adopted generally can prevent crystallization of rolling deformation retained in steels, through the accumulation of deformation to the system of free will generally rise, and to improve their quality iron deformation induced change in the physical and thermodynamic dynamics conditions achieve economies of Eastern kail DIFT. DIFT procedure can increase the intensity bf steel, but does not harm steel toughness. Test results show : for 09CuPTiRE steel yield strength, the average reached after detailed 464MPa and 571MPa tensile strength is achieved average, the average rate of 27.2% steel extension. Compared to conventional techniques, DIFT processes have significantly improved these performances. The study also gained estimated formula of calculating stored energy, and the new body volume rate formula.