Toe and Underbead Cracking in Low-Alloy Steels

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概要

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• Isothermal cracking tests were carried out with H.T. 70, H.T. 80, Ni-Cr and Ni-Cr-Mo steels. From the time-temperature cracking diagrams obtained, the underbead cracks in these four steels proved to have the character of delayed fracture. They did not occur at temperatures above a limiting value of about 75℃ and were suppressed to occur at temperatures below -75℃. The incubation period was shortest at about 25℃. The time-temperature-cracking diagram for the toe cracks in the Ni-Cr steel specimens suggested that they were of the nature of hydrogen-induced cracking. On the other hand, the toe cracks in the Ni-Cr-Mo steel specimens were known to occur during cooling and to be different in nature from hydrogen-induced cracking.

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著者

• KOBAYASHI Takuro

  Tohoku Univ.

• Aoshima Isamu

  Tohoku University

• Kobayashi Takuro

  Tohoku University

関連論文

• Low Temperature Mechanical Properties of High-Nitrogen Type 316 Austenitic Stainless Steel Weld Metals : Gas Shielded Arc Welding of High-Nitrogen Type 316 Austenitic Stainless Steel (Report 2)
• Gas Shielded Arc Welding of High-Nitrogen Austenitic Stainless Steel (Report 1)(Materials, Metallurgy, Weldability)
• Toe and Underbead Cracking in Low-Alloy Steels

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