高純度炭素綱の硝酸塩応力腐食割れに及ぼす微量元素の影響(<小特集>腐食防食小特集)

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The effect of minor elements (C, N, P and S) on stress corrosion cracking (SCC) of high purity carbon steels has been investigated by SCC tests of U-bend, constant load and slow strain rate technique (SSRT) in boiling 60% Ca(NO_3)_2 Solution. The fracture surface was fractographically investigated by scanning electron microscopy. The results obtained are as follows : (1) The threshold stress of steels containing carbon more than its solubility limit increased with increasing carbon content. (2) The threshold stress of carbon steels decreased when the carbon content was reduced to the solubility limit. However, when the carbon content was reduced below about 0.002%, the threshold stress increased again and SCC was hard to occur. (3) Therefore, carbon had a beneficial effect in the precipitated state at the grain boundary as carbides, but had a detrimental effect in the segregated or very fine precipitated state at the grain boundary. (4) Nitrogen had a detrimental effect on SCC in the composition range of 0. 0025〜0. 0375% but its effect was small as compared with carbon. (5) Phosphorus had a detrimental effect on SCC in the composition more than about 0. 035% for the steels water-quenched from 1 203 K. On the other hand, both phosphorus and sulfur had detrimental effects on SCC for the steels furnace-cooled from 1 203 K. However, no effect of phosphorus and/or sulfur was observed on SCC for the steels air-cooled from I 203 K. (6) Manganese promoted SCC susceptibility of the extra low carbon steels.
社団法人日本材料学会の論文
1981-10-15

高純度炭素綱の硝酸塩応力腐食割れに及ぼす微量元素の影響(<小特集>腐食防食小特集)

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