Study On Microstructure And Mechanical Properties Of Austenite High Manganese Steels

Austenite high manganese steels surface will appear when under stress,strain hardening behavior of the surface of austenitic organization will phase into martensitic organization,make its surface along with the increase of the intensity of internal still has good plasticity,so as to realize the unmatched by other steels grade tenacity the optimal combination.Currently,austenite high manganese steels as an important kind of wear-resisting material in the form of casting production,and through the research of rolling production is less.Austenite high manganese steels were studied under different rolling process and cooling process of thermal deformation behavior and organization change rule and austenite after hot rolling and solid solution heat treatment,the mechanical properties of high manganese steels,and the solution heat treatment and hot rolling is the experimental determination of the abrasion performance of the steels was carried out.The main research work and achievements of this paper is as follows:(1)Through the high temperature for single channel time compression experimental determination of the three different composition of true stress-strain curve.Austenite high manganese steels were studied in the process of high temperature compression deformation behavior,organization characteristics and evolution laws.Austenite were analyzed the factors affecting the deformation resistance of high manganese steels.Austenite high manganese steels were studied in 800?1000? temperature,strain rate in the range of 0.01?10.0s-1 deformation behavior of the organization and establish the thermal processing parameters.The results showed that the austenite high manganese steels should as far as possible in the process of rolling deformation under high temperature and low strain rate,to produce deformation and recrystallization organization.(2)The experimental steels after hot rolling and solid solution heat treatment process of organization and mechanical properties were studied,the results show that the experimental steel 204-2 has the best comprehensive mechanical properties.By electronic probe for the experimental steels secondary electron like observation,found that organizations within a large number of mechanical twin.By transmission electron microscopy(SEM)of the experimental steels organizational transformation in the process of work hardening,observing its organization in the process of work hardening by austenite to martensite transformation.By surface scanning for the experimental steels around the grain boundary carbide network to determine the composition,found around the grain boundary with partial poly C and P elements.Around the grain boundary carbide network by energy spectrum analysis of C and Mn compounds(3)Use the MLD-10 abrasive wear testing machine to simulate the wear condition of dynamic load type,and combining with the experimental technology of above research,the experiment of steels after hot rolling and solid solution heat treatment on the impact abrasive wear experiment,with the domestic now commonly used wear-resisting X65 and X70 pipeline steels are compared,and wear resistance organization structure and mechanical properties was studied on the influence of the experimental steels wear resistance.And scanning electron microscopy(SEM)on the surface of the sample after wear morphology observation,analysis of the wear mechanisms.The results show that the experimental steel 204-2 after two hours of lost weight minimum wear experiment.Its wear resistance is 2.8 times that of X65 was 2.4 times of X70.Through this article research,to get the best components of the setting,the best experimental steels rolling process and cooling system,for this kind of steels in the future industrial production provides an important guiding significance.