Prediction of Charpy impact toughness of steel weld heat-affected zones by combined micromechanics and stochastic fracture model – Part II : Model validation by experiment

Abstract Three steels were designed based on HSLA-100 with additional levels of Mn, Ni, Cr and Cu. The steels were prepared by controlled rolling and tempered at temperatures in range of 550–700°C. The continuous cooling time curves were shifted to longer times and lower temperatures with the increased tendency for the formation of martensite at lower cooling rates. The microstructures revealed that controlled rolling results in austenite with uniform fine grain structure. The steel with the highest amount of Mn showed the greatest strength after tempering at 750 °C. The top strength was attributed to the formation of Cu-rich particles. The steel with 1.03 wt.% Mn, tempered at 650 °C exhibited the best Charpy impact toughness at –85°C. On the other hand, the steel that contained 2.11 wt.% Mn and tempered at 700 °C showed the highest yield strength of 1 097.5 MPa (∼159 ksi) and an impact toughness of 41.6 J at –85°C.

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Charpy impact toughness of conventional and advanced composite laminates for aircraft construction

Materials Research ◽

10.1590/s1516-14392009000400004 ◽

2009 ◽

Vol 12 (4) ◽

pp. 395-403 ◽

Cited By ~ 15

Author(s):

José Ricardo Tarpani ◽

Omar Maluf ◽

Maria Cristina Adami Gatti

Keyword(s):

Impact Toughness ◽

Composite Laminates ◽

Charpy Impact ◽

Advanced Composite ◽

Charpy Impact Toughness

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Effects of Metallurgical and Mechanical Factors on Charpy Impact Toughness of Extra-Low Interstitial Ferritic Stainless Steels

Toughness of Ferritic Stainless Steels ◽

10.1520/stp38209s ◽

2009 ◽

pp. 202-202-19 ◽

Cited By ~ 1

Author(s):

N Ohashi ◽

Y Ono ◽

N Kinoshita ◽

K Yoshioka

Keyword(s):

Impact Toughness ◽

Stainless Steels ◽

Charpy Impact ◽

Ferritic Stainless Steels ◽

Charpy Impact Toughness ◽

Mechanical Factors

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The Effect of Cold Work and Fracture Surface Splitting on the Charpy Impact Toughness of Quenched and Tempered Steels

ISIJ International ◽

10.2355/isijinternational.44.1114 ◽

2004 ◽

Vol 44 (6) ◽

pp. 1114-1120 ◽

Cited By ~ 3

Author(s):

Z. Sterjovski ◽

D. P. Dunne ◽

D. G. Carr ◽

S. Ambrose

Keyword(s):

Impact Toughness ◽

Fracture Surface ◽

Cold Work ◽

Charpy Impact ◽

Charpy Impact Toughness

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Mechanical Properties of SA508 Gr.4N Model Alloys as a High Strength RPV Steel

ASME 2010 Pressure Vessels and Piping Conference: Volume 9 ◽

10.1115/pvp2010-26002 ◽

2010 ◽

Cited By ~ 1

Author(s):

Min-Chul Kim ◽

Ki-Hyoung Lee ◽

Bong-Sang Lee ◽

Whung-Whoe Kim

Keyword(s):

Mechanical Properties ◽

Fracture Toughness ◽

Impact Toughness ◽

Power Plants ◽

Charpy Impact ◽

Alloying Elements ◽

Low Alloy Steels ◽

Charpy Impact Toughness ◽

Age Related ◽

Alloy Steels

Demands of RPV materials with higher strength and toughness are rising to increase the power capacity and the operation life of nuclear power plants. The ASME SA508 Gr.4N specification can give a superior toughness and strength to the commercial low alloy steels such as SA508 Gr.3. However, the SA508-Gr.4N steels have not yet been used commercially due to a lack of information of the productivity and the age related properties. While the irradiation embrittlement studies are going-on, the current paper focused on the effects of alloying elements such as Ni, Cr and Mo on the fracture mechanical properties of the SA508 Gr.4N low alloy steels. Various model alloys were fabricated by changing the contents of alloying elements based on the composition range of the ASME specification. Tensile properties, Charpy impact toughness and fracture toughness of the model alloys were evaluated and those properties were discussed with the microstructural characteristics of each alloy. The strengths of the alloys were increased with increase of the Ni and Mo contents while there was no remarkable change of the yield strength with the Cr addition. The Charpy impact and fracture toughness were considerably improved with the increase of Ni, Cr contents. The Mo addition did not change the toughness properties significantly. The Cr contents were more effective on the fracture toughness through changing the carbides precipitation characteristics and the Ni contents were effective on the Charpy impact toughness through changing the effective grain size.

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