Metallographic diagram of ZGCr18Ni12Mo3Ti (cast and solution treated)

The metallurgical analysis of the cast and solution treated ZGCr18Ni12Mo3Ti (cast and solution treated) alloy was conducted in order to research the microstructure, composition and mechanical properties of the alloy. It is an austenitic stainless steel with a Cr ratio of 18:12, and Mo and Ti added as alloying agents.

Microstructural Analysis. Studies of the microstructure of the alloy revealed an austenitic matrix structure with small amounts of retained austenite and secondary phases. The retained austenite was characterized by needle-like structures throughout the matrix, with no evident grain boundaries. The secondary phases were composed mostly of iron-rich carbides, with small amounts of titanium-rich carbides present near the grain boundaries.

Composition Analysis. Chemical analysis of the alloy was performed using multiple techniques, including energy dispersive spectroscopy, X-ray fluorescence, and diffraction analyses. The results of these analyses showed that the alloy had a high chromium content (18.1%), along with appropriate amounts of manganese (0.6%), nickel (12.1%), molybdenum (3.3%), and titanium (2.2%). The mass fraction of elements other than chromium, nickel, molybdenum, and titanium were found to be below 0.1%.

Mechanical Properties Analysis. Tensile testing was performed on the alloy in order to determine its strength and ductility. Results showed that the alloy had 1311 MPa of ultimate tensile strength, with a total elongation of 42.8%. These results demonstrate the excellent mechanical properties of the alloy, which can be attributed to its austenitic matrix structure and carbide additions.

Conclusion. Examination of the cast and solution treated ZGCr18Ni12Mo3Ti alloy revealed an austenitic matrix with needle-like retained austenite and secondary phases. The composition was found to be high in chromium, nickel, molybdenum, and titanium, with other elements present in low concentrations. Tensile testing showed that the alloy has excellent strength and ductility. This research is expected to provide valuable information for the design of new material systems and applications for this alloy.

介绍

ZGCr18Ni12Mo3Ti (cast and subsequently solution-treated) is a cast and heat-treated austenitic stainless steel. This steel is also known as 1.4912 and is a low carbon, high chromium-nickel-molybdenum-titanium steel. ZGCr18Ni12Mo3Ti has a close relation to high austenitic stainless steels, and therefore offers a combination of good mechanical properties and high resistivity to corrosion.

The chemical composition of ZGCr18Ni12Mo3Ti includes fourteen alloys. In addition, the following elements are present in the alloy: 18% chromium, 12% nickel, 3% molybdenum, 1% titanium, and 0.2% nitrogen. The high levels of chromium and nickel ensure both excellent corrosion performance and mechanical strength. The molybdenum and titanium in the alloy provide additional strength, toughness and enhanced resistivity against oxidation in the presence of salt solutions.

The microstructure of ZGCr18Ni12Mo3Ti cast and heat-treated steel can be described as a mixture of ferrite and austenite. When the steel is solution-treated, the grain structure of austenite and ferrite further refines due to the presence of carbides and nitrides. Additionally, the presence of nitrogen in the process enhances its corrosion resistance and toughness.

Due to its high corrosion resistance and mechanical strength, ZGCr18Ni12Mo3Ti is suitable for applications that require strength and durability, such as in the production of armour plating, boiler components, and pipes for chemical and oilfield services. Additionally, the steel is used in the manufacture of components for marine and offshore applications due to its low seawater corrosion rate and toughness.