Characteristics of hydrogen embrittlement,stress corrosion cracking and tempered martensite embrittlement in high-strength steels |
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| Affiliation: | 1. H.H. Uhlig Corrosion Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA;2. Metallurgical Laboratory, Israel Air Force, PO Box 02745, Israel;3. Department of Materials Engineering, Ben-Gurion University, PO Box 653, Beer-Sheva 84105, Israel;1. State Key Laboratory for Mechanical Behavior of Materials, Xi׳an Jiaotong University, Xi׳an 710049, China;2. College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 211816, China;1. School of Mechanical and Materials Engineering, Washington State University, Pullman 99164, USA;2. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China;3. Department of Geosciences, Center for Materials by Design, and Institute for Advanced Computational Science, State University of New York, Stony Brook, NY 11794-2100, USA;1. Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, 980-8577, Japan;2. National Institutes for Quantum and Radiological Science and Technology (QST), 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5148, Japan;3. Japan Atomic Energy Agency (JAEA), 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5148, Japan;4. Kobe Steel, Ltd., 1-5-5, Takatsukadai, Nishi-ku, Kobe, 651-2271, Japan |
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| Abstract: | Characteristics of tempered martensite embrittlement (TME), hydrogen embrittlement (HE), and stress corrosion cracking (SCC) in high-strength steels are reviewed. Often, it is important to determine unambiguously by which of these mechanisms failure occurred, in order to suggest the right actions to prevent failure recurrence. To this aim, samples made of high-strength AISI 4340 alloy steel were embrittled by controlled processes that might take place, for example, during the fabrication and service of aircraft landing gears. The samples were then fractured and characterized using light and scanning electron microscopy, microhardness tests, and X-ray diffraction. Fractography was found to be the most useful tool in determining which of these mechanisms is responsible for a failure, under similar conditions, of structures made of AISI 4340 alloy steel. |
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