Fracture toughness properties of high-strength martensitic steel within a wide hardness range |
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| Authors: | N M Abd-Allah M S El-Fadaly M M Megahed A M Eleiche |
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| Affiliation: | (1) Technical Departments, Maadi Company for Engineering Industry, Cairo, Egypt;(2) Mechanical Production Department, Faculty of Engineering, Suez-Canal University, Egypt;(3) Mechanical Design and Production Department, Faculty of Engineering, Cairo University, Egypt;(4) Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Saudi Arabia |
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| Abstract: | Fracture toughness tests were carried out on six grades of high-strength martensitic steel within the hardness range from
270 to 475 HB. Four types of tests were performed: (a) Charpy V-notch (CVN) impact over the temperature range −120 to 60 °C,
(b) plane strain fracture toughness, K
IC
, near the onset of crack growth, (c) fracture toughness, J
IC
, near the initiation of slow crack growth, and (d) fracture toughness, J
iC
, and crack tip opening displacement (CTOD
iC
) at the onset of slow crack growth using direct current potential drop (DCPD) technique. Further, true plane strain fracture
toughness, K
o
, at the onset of crack initiation was determined. Fracture toughness behavior including the measured and determined values
of CVN, K
IC
, K
o
, J
IC
, K
iC
, and CTOD
iC
have been interrelated over the entire hardness range using the various analytical and empirical correlations reported in
the literature. The results indicate that the steel acquires the optimum fracture toughness properties at a hardness of 305
HB, corresponding to a tempering temperature of 630 °C. Further, the steel exhibits a slight 300 °C temper embrittlement phenomenon. |
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| Keywords: | Charpy V-notch crack tip opening displacement direct current potential drop plane strain fracture toughness stress intensity factor temper embrittlement transition temperature true plane fracture toughness |
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