Effect Of Titanium On Microstructure And Properties Of ZG06Cr13Ni4Mo

With excellent mechanical properties, ZG06CR13Ni4Mo martensitic stainless steel has been widely used in industry. Hydropower equipment in large turbine runner flow passage components are using the material. Hydropower development trend of the future puts forward higher requirements on the mechanical properties, wear resistance and corrosion resistance. The element titanium was added based on the composition of ZG06Cr13Ni4Mo, and the research purpose is studying the effect of titanium and stabilizing treatment on the microstructure, mechanical properties, wear resistance and corrosion resistance; and trying to add titanium and increase the right amount of carbon to improve the material properties, the results show that:With the titanium content increasing from a very small amount to0.31%, ZG06Cr13Ni4Mo martensitic stainless steel cast microstructure is lath martensite+a small amount of residual austenite, little changing in phase ratio, but grains gradually refine. After normalizing+tempering twice, all samples are composited of lath tempered martensite and dispersed reverse austenite. The tempered martensite content gradually reduce with the increase of the titanium, and reverse austenite content increase. With the increase of the titanium, tensile strength first decreases and then increases, impact energy first increase and then reduces, the hardness and wear resistance gradually reduce, corrosion resistance increases. However, the wear resistance of the sample containing titanium0and the sample containing titanium0.14%is quite. When the titanium content of0.14%, the sample has good comprehensive performance, HBW:231, Rm:760MPa,A:16.7%, Ak:123J, ε:1.751km/g, Ecorr:-1.0950V, Icorr:1.390x10-4A-cm-2.After stabilizing treatment+normalizing+tempering twice of ZG06Cr13Ni4Mo containing the titanium0.14%. The results show that, with the stabilization processing temperature increases, all samples are composited of lath tempered martensite and dispersed reverse austenite. Grain size is smaller than stabilizing treatment of the sample which did not carry. Yield strength increases; impact energy slightly reduces; corrosion resistance are markedly improved. The samples of stabilizing treatment at870℃and920℃have considerable corrosion resistance, so a more reasonable stabilizing treatment temperature is870℃.In order to improve the properties, titanium content of0.37%,the amount of carbon increased to0.077%, and the sample was taken into four different specialized heat treatment processes—stabilizing treatment+normalizing+tempering twice. Compared with the carbon content of0.045%, the titanium content of0.14%sample, the lath martensite content decreased, the reverse austenite content increases, and grain finers. All properties are further improved:HBW:245, Rm:830MPa, A:18.5%, Z:62%, Ak:115J, ε:2.376km/g, Ecorr:-0.9923V, Icorr:7.532x10-6A.cm-2.The mechanical properties and wear resistance of ZG06Cr13Ni4Mo is improve by adding titanium and increasing the right amount of carbon, and corrosion resistance does not reduce, While stabilizing treatment gaves full play to the role of titanium to improve corrosion resistance. It is very beneficial to extend the service life of materials and reduce production costs.