Brittle Fracture of Rocks

Abstract The 21/4% Nickel Steel possesses a combination of moderate strength and superior resistance to brittle fracture at subzero temperatures. It is one of the most economical materials for the construction of equipment to operate at temperatures as low as -90 F. It is intended primarily for welded pressure vessels. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-378. Producer or source: Alloy steel mills and foundries.

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Guidance for production, testing and diagnostics of polymer insulators with respect to brittle fracture of core materials

10.3403/30214847u ◽

2015 ◽

Keyword(s):

Brittle Fracture ◽

Production Testing ◽

Polymer Insulators ◽

Core Materials

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Researches on Brittle Fracture Initiation of Welded Steel Structure in Japan (Part 1)

JOURNAL OF THE JAPAN WELDING SOCIETY ◽

10.2207/qjjws1943.42.157 ◽

1973 ◽

Vol 42 (2) ◽

pp. 157-178 ◽

Cited By ~ 1

Author(s):

Hiroshi Kihara ◽

Kunihiko Satoh ◽

Masao Toyoda

Keyword(s):

Brittle Fracture ◽

Steel Structure ◽

Fracture Initiation ◽

Welded Steel

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Effects of structural inhomogeneities on the steel balls resistance to loading

Voprosy Materialovedeniya ◽

10.22349/1994-6716-2020-103-3-29-38 ◽

2020 ◽

pp. 29-38

Author(s):

O. B. Berdnik ◽

I. N. Tsareva ◽

L. A. Krivina ◽

S. V. Kirikov ◽

S. I. Gerasimov ◽

...

Keyword(s):

Brittle Fracture ◽

Bearing Steel ◽

Metallographic Analysis ◽

Structural Factors ◽

Steel Shkh15 ◽

Maximum Hardness ◽

High Shock ◽

Steel Balls ◽

Plasticity Coefficient ◽

Microstructure Of The Material

When conducting impact tests of protective glasses, nonunique cases of destruction of balls made of bearing steel ShKh15 were recorded. The causes of their destruction were determined. The state of the material was studied by fractographic and metallographic analysis, hardness and microhardness measurement. In the structure of the metal of all the balls, no critical defects were found such as flockens, shells and microcracks, but adverse factors were detected in the microstructure of the material, namely, the presence of fineneedle martensite with excessive carbides. It is established that the detected structural factors lead to liability to brittle fracture, an increase in the hardness of the material, a decrease in plasticity. To prevent brittle fracture of the balls and provide a reserve of plasticity of steel ShKh15 at high shock loads assessment calculations of ductility coefficient were made; and it was recommended to limit the maximum hardness of the material critical value HV=5.70 HPa (54 HRC), with the corresponding plasticity coefficient equal to 0.8.

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