球状黒鉛鋳鉄の強度評価に関する基礎的研究　ＩＩ　　３％塩酸中および人工海水中での腐食疲労

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  • Fundamental study of microstructure-oriented strength assessment of a spheroidal graphite cast iron. 2nd Report. Corrosion fatigue in 3% hydrochloric acid and synthetic seawater.
  • キュウジョウ コクエン チュウテツ ノ キョウド ヒョウカ ニ カンスル キソ

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Ferrite-base and pearlite-base spheroidal graphite cast irons were prepared to examine corrosion fatigue resistance in 3% hydrochloric acid and synthetic seawater. Rotating bending corrosion fatigue tests were conducted at two rates 3400 rpm and 260 rpm. From the tests in air and two corrosive environments, the following results were obtained : (1) The pearlite-base material (F) showed a fatigue strength stronger than that of the ferrite-base material (A) in the intermediate-cycle fatigue range, irrespective of environment or rotating speed. In the high-cycle fatigue range, the fatigue strengths of both materials asymptotically approached to coincide. (2) Anodic dissolution of graphite and local cathodic dissolution of cementite in pearlite played a primary role in the high-cycle corrosion fatigue process. (3) Those dissolutions described above induced a fatigue process different from that in air and resulted in diminished scatter of the S-n curves.

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