The Influence Of The Rare Earth Metals Modification On The Fracture Toughness Of G17CrMo5-5 Cast Steel At Low Temperatures

Abstract This paper presents the influence of the rare earth metals (REM) modification on mechanical properties and fracture toughness of G17CrMo5-5 cast steel at low temperatures. The REM was in the form of mishmetal. The research has been performed on serial (several) industrial melts. The fracture toughness values of unmodified and modified cast steel at the temperature range from −80°C to 20°C were tested. The reference temperatures of the brittle-to-ductile transition, TQ, for both unmodified and modified cast steel were determined. The positive influence of the modification by REM on the fracture toughness and the reference temperature TQ are shown.

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Characteristics of the manufacturing technology of dense parts from, and the mechanical properties of, some hexaborides of the rare-earth metals

Soviet Powder Metallurgy and Metal Ceramics ◽

10.1007/bf00774242 ◽

1965 ◽

Vol 3 (5) ◽

pp. 406-409 ◽

Cited By ~ 6

Author(s):

B. G. Arabei ◽

E. N. Shtrom ◽

Yu. A. Lapitskii

Keyword(s):

Mechanical Properties ◽

Rare Earth ◽

Rare Earth Metals ◽

Manufacturing Technology ◽

The Rare Earth

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Experimental – Numerical Analysis of Stress State in Front of the Crack Tip of Modified and Unmodified G17CrMo5-5 Cast Steel by Rare Earth Metals in a Brittle-Ductile Transition Region

Archives of Metallurgy and Materials ◽

10.1515/amm-2016-0196 ◽

2016 ◽

Vol 61 (2) ◽

pp. 1175-1181

Author(s):

I. Dzioba ◽

R. Pala ◽

J. Kasinska

Keyword(s):

Fracture Toughness ◽

Rare Earth ◽

Stress State ◽

Numerical Analysis ◽

Crack Extension ◽

Cast Steel ◽

Rare Earth Metals ◽

Initial Moment ◽

Brittle Ductile Transition

Abstract In the paper presented experimental data and numerical analysis of stress distribution in front of the crack of two melts of low-alloy G17CrMo5-5 cast steel-modified (M) by rare earth metals and original, unmodified (UM) in the temperature range, according to the brittle-ductile transition region. Experimental tests include determination of the tensile properties and fracture toughness characteristics for the UM and M cast steel. Numerical analysis includes determination of stress distribution in front of the crack at the initial moment of the crack extension. In the numerical computations, experimentally tested specimens SEN(B) were modeled. The true stress-strain curves for the UM and M cast steel were used in the calculation. It was shown that the maximum of the opening stresses at the initial moment of the crack extension occurs in the axis of the specimens and reaches similar level of about 3.5σ0 for both UM and M cast steel. However, the length of the critical distance, measured for stress level equal 3σ0, is great for the M in comparison to the UM cast steel. Also was shown that the UM cast steel increased the level of the stress state triaxiality parameters that resulted in a decrease of fracture toughness.

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