ドリルパイプ材の腐食疲労特性に及ぼす硫黄含有量の影響 : 第1報、圧延方向採取回転曲げ疲労試験による考察

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The drilling pipe suffers from rotating bending stress, accompanied by axial stresss and torsional stress, It has been reported that the initiation of a crack is sulphide nonmetallic inclusions which also have a relation to the crack propagation rate. Fatigue tests have been performed in air, dripping corrosive liquids with pH 7 and pH 13 under a rotating bending load at the cyclic frequency of 300 rpm. The materials used in these tests were four kinds of normalized and tempered (NT) steels and four kinds of quenched and tempered (QT) ones whose sulphur content changed from 0.001 to 0.050 %. Corrosion fatigue strength was evaluated on corrosive liquids and sulphur content and fractographic observation has been also discussed. It was confirmed that the fatigue strength at pH 7 is not dependent on sulphur content, though the number of pits and cracks increase according to the sulphur content. In addition, the number of pits would be dependent not only on the amount of MnS
社団法人日本機械学会の論文
1989-08-25