Microstructure and properties of Cu-Ti-Ni composite coatings on gray cast iron fabricated by laser cladding

Microstructure and properties of the high carbon equivalent gray cast iron modified by the rare earth metal are investigated by optical microscopy, scanning electronic microscopy, Brinell hardness and tensile testing. The results show that the primary austenite dendritic is refined, and the morphology of graphite is transformed from A-type to D-type undercooling graphite with increment of the rare earth metal (REM), even with the vermicular graphite present. The lamellae are becoming thinner with increment of rare earth metal. There are double peaks between the addition of the rare earth metal and the tensile strength/hardness. The iron would have the best comprehensive property when 0.30% REM is added.

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Effect of Mechanical Vibration on Microstructure and Mechanical Properties of Gray Cast Iron in Lost Foam Casting

Mathematical Problems in Engineering ◽

10.1155/2021/4936147 ◽

2021 ◽

Vol 2021 ◽

pp. 1-8

Author(s):

Kai Qiu ◽

Bota Xiao

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Cast Iron ◽

Gray Cast Iron ◽

Mechanical Vibration ◽

Gray Cast ◽

Lost Foam Casting ◽

Flake Graphite ◽

Microstructure And Properties ◽

Lost Foam

In order to reveal the effect of vibration solidification on microstructure and properties of gray cast iron in lost foam casting, Y-shaped HT100 gray cast iron was prepared by vibration lost foam casting, and the effect of amplitude on the microstructure and properties of gray cast iron was studied. The results showed that, with the increase in amplitude, the short and thin A-type flake graphite increases, and the austenite structure transforms from columnar to cellular. The hardness, tensile strength, and elongation of gray cast iron first increase and then decrease with the increase in amplitude. The appropriate amplitude in the process of Y-shaped HT100 gray cast iron by lost foam casting is 2 mm, while the tensile strength and elongation of gray cast iron are the highest, with the values of 147.51 MPa and 1.17%, respectively. The change of mechanical properties of gray cast iron is mainly determined by the morphology and distribution of austenite in gray cast iron and A-type flake graphite.

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Effect of Carbon Content on Microstructure and Properties of Gray Cast Iron

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.971-973.44 ◽

2014 ◽

Vol 971-973 ◽

pp. 44-48

Author(s):

Ya Li Sun

Keyword(s):

Mechanical Properties ◽

Cast Iron ◽

Carbon Content ◽

Liquid Iron ◽

Gray Cast Iron ◽

Gray Cast ◽

Carbon Equivalent ◽

Microstructure And Properties ◽

Metallographic Observation ◽

Equivalent Control

Though the study of carbon content on the microstructure and properties of gray cast iron, mechanical properties test as well as metallographic observation, we could see that the mobility of molten iron is the best when carbon equivalent control at around 4.3%; Liquid iron tend to precipitate A or B type graphite and enhance the casting organization and property when carbon content was increased properly.

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