Fatigue Crack Propagation Characteristic and Fatigue Fracture Toughness in 780 MPa Grade High Strength Steel Weldments at Low Temperature

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  • 低温における780 MPa級高張力鋼溶接各部の疲労き裂伝ぱ特性および疲労破壊靭性
  • テイオン ニ オケル 780MPaキュウ コウチョウリョク コウ ヨウセツ カ
  • Fatigue Crack Propagation Characteristic and Fatigue Fracture Toughness in 780 MPa Grade High Strength Steel Weldments at Low Temperature

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Abstract

Fatigue test and fracture toughness test in 780 MPa grade high strength steel weldments in the temperature range from 98 K to room temperature were experimentally carried out. Both the tests were performed with a compact tension specimen by using a program-load-controlled 0.98 MN fatigue testing machine.<BR>Main results obtained are summarized as follows:<BR>(1) The fatigue crack propagation rate in the base metal shows a similar value in both the weld metal and HAZ.<BR>(2) The trend of fatigue crack propagation characteristic in weldments in the temperature range from 223 K to room temperature is in good agreement with the dislocation dynamics theory of fatigue crack propagation.<BR>(3) Fatigue fracture toughness, Kfc and fracture toughness, Kc in the base metal are larger than in both the weld metal and HAZ.

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