Development of heat treatment parameters to improve fracture toughness and grain size of an embrittled maraging steel

Sinha, P. P.; Sreekumar, K.; Babu, N. S.; Pant, Bhanu; Natarajan, Arivazhagan; Nagarajan, K. V.

doi:10.1007/bf02833148

Cited by 16 publications

(13 citation statements)

References 12 publications

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“…Saul et al 11 observed the increase of room temperature tensile strength with grain refinement of austenite, in agreement to results presented here. Also, Sinha et al 12 observed the increase of fracture toughness of solution treated specimens with the increase of austenitizing temperature and, consequently, austenitic grain size. On the other hand, Rack 13 reported that the prior austenite grain size did not affect the fracture toughness of unaged 18Ni maraging steel.…”

Section: Steel Sae4340mentioning

confidence: 96%

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Influence of Austenitizing on the Mechanical Properties of Maraging 300 and Sae 4340 Steels - Comparative Study

et al. 2017

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Maraging steels with 18wt%Ni and 10wt%Co are precipitation hardenable steels selected for special applications. These steels are quenched and aged in the 480 -600 o C range. Ti and Mo are added to precipitate during aging as fine Ni 3 (Ti,Mo) and Fe 2 Mo particles. Aging at high temperatures causes overaging due to coarsening of particles and austenite formation. SAE 4340 is a typical low alloy medium carbon steel for quenching and tempering. The best combination of mechanical properties is attained by quenching and tempering in the 650 -670 o C range. These two steels are selected for services where an optimum combination of mechanical strength, toughness and fatigue resistance is required. In this work, the austenitizing temperature in the quenching treatment was varied in order to evaluate the effects on microstructure and mechanical properties of both steels. The results showed that the effect of previous austenite grain size on the toughness was different in the two steels analyzed.

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Section: Steel Sae4340mentioning

confidence: 96%

“…Other works have investigated the effect of grain size on mechanical properties of maraging 18%Ni steels [11][12][13] . Saul et al 11 observed the increase of room temperature tensile strength with grain refinement of austenite, in agreement to results presented here.…”

Section: Steel Sae4340mentioning

confidence: 99%

Influence of Austenitizing on the Mechanical Properties of Maraging 300 and Sae 4340 Steels - Comparative Study

et al. 2017

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“…Sinha et al [38] studied the effect of thermal cycling between room temperature and 925°C on C18Ni1700 and demonstrated a major effect of grain size refinement. Their studies on C18Ni1700 and T18Ni1700 showed that just one cycle has a significant refining effect on PAG size [39].…”

Section: Cycling Between Ambient Temperature and Amentioning

confidence: 99%

“…Grain refinement by thermal cycling in maraging steel has been attributed to new sets of austenitic grains forming on the defect structures introduced by α-to-c shear transformation during the heating cycle [36,38]. Fast heating rates promote this transformation.…”

Section: Cycling Between Ambient Temperature and Amentioning

confidence: 99%

“…It causes serious problems in processing components of thick sections of these steels [41]. Sinha et al [38] reported a decrease in plane strain fracture toughness (K IC ) due to TE in rolled rings of cobalt-bearing 18Ni1700 grade maraging steels. Ashida et al [46] reported loss of ductility and toughness resulting from the precipitation of TiC on grain boundaries after a two-stage austenitising treatment (holding the austenite at 800 to 1000°C after solution treatment at 1200°C) of maraging steel.…”

Section: Thermal Embrittlement Of Maraging Steelsmentioning

confidence: 99%

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Progress in understanding the metallurgy of 18% nickel maraging steels

Rao

2006

International Journal of Materials Research

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Progress in understanding the metallurgy of 18 % nickel maraging steelsMaraging steels based on iron -nickel martensite constitute a very important family of high-strength steels, which distinguishes itself by demonstrating an unparalleled combination of excellent fabricability and high strength and fracture toughness after heat treatment. Heat treatment of these steels has now been perfected to ensure consistently high levels of strength, ductility, and toughness in a variety of product shapes and sizes. Cobalt-free variants have been commercialized as part of efforts to save production costs. Further knowledge has been generated on 18 % nickel maraging steels regarding phases precipitating during aging, thermal embrittlement, thermal cycling and austenite reversion/retention and their effect on mechanical properties. The paper reviews the progress made over the last one and half decades.

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Determination of Previous Austenite Grain Size 9%Ni Low Carbon Steel and Its Effect on Impact Toughness at −196 °C

Tavares

Cunha

Barbosa

et al. 2018

Advanced Structured Materials

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Development of heat treatment parameters to improve fracture toughness and grain size of an embrittled maraging steel

Cited by 16 publications

References 12 publications

Influence of Austenitizing on the Mechanical Properties of Maraging 300 and Sae 4340 Steels - Comparative Study

Influence of Austenitizing on the Mechanical Properties of Maraging 300 and Sae 4340 Steels - Comparative Study

Progress in understanding the metallurgy of 18% nickel maraging steels

Determination of Previous Austenite Grain Size 9%Ni Low Carbon Steel and Its Effect on Impact Toughness at −196 °C

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