Tempering of Direct Quenched Low-Alloy Ultra-High-Strength Steel, Part II – Mechanical Properties

Sakari Pallaspuro; Antti Kaijalainen; Teijo Limnell; David A. Porter

doi:10.4028/www.scientific.net/AMR.922.580

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 922Tempering of Direct Quenched Low-Alloy...

Tempering of Direct Quenched Low-Alloy Ultra-High-Strength Steel, Part II – Mechanical Properties

Abstract:

Direct quenched untempered ultra-high-strength structural steels can possess good toughness and weldability when based on low carbon contents. In this study, the influence of tempering at 500 °C has been investigated to evaluate the possibilities of widening the range of strengths that can be produced from one 0.1% C alloy composition. The study covered the four microstructural states presented in part I: direct quenched (DQ), reheated and quenched (RQ) and their tempered variants (DQ-T and RQ-T). In addition to tensile testing, the Charpy-V transition temperature T_28Jand the fracture toughness reference temperature T₀ were determined for 6 mm thick specimens. The hardness of the DQ and RQ states was identical at ca. 400 HV. However, on tempering, the DQ state retained its hardness better than the RQ state with hardness values 346 HV (DQ-T) and 327 HV (RQ-T). The yield strengths of the DQ materials were ca. 100 MPa higher than those of the RQ materials both as-quenched and after tempering. Despite the higher strength of the DQ and DQ-T states, both had lower T_28J temperatures than the RQ and RQ-T states mainly due to their finer effective grain sizes. The widely used correlation between the T_28J and the T₀ temperatures was not obeyed and the reasons for this are discussed.

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Periodical:

Advanced Materials Research (Volume 922)

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580-585

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.922.580

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Online since:

May 2014

Authors:

Sakari Pallaspuro*, Antti Kaijalainen, Teijo Limnell, David A. Porter

Keywords:

Direct Quenching, T₀ Correlation, Tempering, Toughness

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