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Fatigue, monotonic and fracture toughness properties of a Cr-Mn-N steel

Vareda, L.V. / Spinelli, D.

The low-cycle fatigue, monotonic and fracture toughness behaviour of E3949, a Cr-Mn-N austenitic stainless steel, used for drillcollar connections was studied. Low-cycle fatigue tests were carried out at room temperature under total strain control in the range of 0.40 to 1.50% using Companion Specimens Test (CST) and Incremental Step Test (IST) methods. Cyclic softening without saturation was observed in all tests. Massing cyclic stress-strain behaviour was observed only with the IST method. The fatigue life behaviour obeyed Basquin and Coffin-Manson relationships and the high value obtained for epsilon '_f imparts a significant improvement in fatigue resistance of this alloy compared to AISI 304LN. The J-R curves and J_IC values were obtained at room temperature and at 150 degree C by using single specimens and the elastic compliance technique for crack length measurement. The observed decrease in crack initiation fracture toughness at 150 degree C is proposed to be due to a dynamic strain ageing effect, which impairs ductility.

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Fatigue, monotonic and fracture toughness properties of a Cr-Mn-N steel

Vareda, L.V. / Spinelli, D.

The low-cycle fatigue, monotonic and fracture toughness behaviour of E3949, a Cr-Mn-N austenitic stainless steel, used for drillcollar connections was studied. Low-cycle fatigue tests were carried out at room temperature under total strain control in the range of 0.40 to 1.50% using Companion Specimens Test (CST) and Incremental Step Test (IST) methods. Cyclic softening without saturation was observed in all tests. Massing cyclic stress-strain behaviour was observed only with the IST method. The fatigue life behaviour obeyed Basquin and Coffin-Manson relationships and the high value obtained for epsilon '_f imparts a significant improvement in fatigue resistance of this alloy compared to AISI 304LN. The J-R curves and J_IC values were obtained at room temperature and at 150 degree C by using single specimens and the elastic compliance technique for crack length measurement. The observed decrease in crack initiation fracture toughness at 150 degree C is proposed to be due to a dynamic strain ageing effect, which impairs ductility.

Fatigue, monotonic and fracture toughness properties of a Cr-Mn-N steel

Vareda, L.V. / Spinelli, D.

The low-cycle fatigue, monotonic and fracture toughness behaviour of E3949, a Cr-Mn-N austenitic stainless steel, used for drillcollar connections was studied. Low-cycle fatigue tests were carried out at room temperature under total strain control in the range of 0.40 to 1.50% using Companion Specimens Test (CST) and Incremental Step Test (IST) methods. Cyclic softening without saturation was observed in all tests. Massing cyclic stress-strain behaviour was observed only with the IST method. The fatigue life behaviour obeyed Basquin and Coffin-Manson relationships and the high value obtained for epsilon '_f imparts a significant improvement in fatigue resistance of this alloy compared to AISI 304LN. The J-R curves and J_IC values were obtained at room temperature and at 150 degree C by using single specimens and the elastic compliance technique for crack length measurement. The observed decrease in crack initiation fracture toughness at 150 degree C is proposed to be due to a dynamic strain ageing effect, which impairs ductility.

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Title:

Fatigue, monotonic and fracture toughness properties of a Cr-Mn-N steel

Contributors:

Vareda, L.V. (author) / Spinelli, D. (author)

Published in:

International Journal of Fatigue ; 23 ; 857-863

Publication date:

2001

Size:

7 Seiten, 15 Quellen

ISSN:

DOI:

https://doi.org/10.1016/S0142-1123(01)00060-3

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Bruchzähigkeit , Materialermüdung , Elastizität , Risseinleitung , Zugeigenschaft , Ermüdung bei niedrigen Lastspielzahlen , austenitischer nichtrostender Stahl , Stickstoffzusatz , Chromzusatz , Manganzusatz , zyklische Belastung , Chrommanganstahl

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