Solidification Crack Susceptibility in Weld Metals of Fully Austenitic Stainless Steels (Report II) : Effect of Ferrite, P, S, C, Si and Mn on Ductility Properties of Solidification Brittleness
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概要
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The Trans-Varestraint test was carried out to assess the cracking tendency of austenitic weld metals by obtaining the solidification brittleness temperature range (BTR) and ductility curves. The hot crack susceptibility among five types of commercial austenitic stainless steels was compared first of all. The result determined the temperature ranges over which cracking occurred and suggested that austenitic SUS 304 (Japanese Industrial Standard: 18Cr-8Ni type corresponding to AISI 304), etc. containing δ-ferrite were resistant to hot cracking due to the narrow BTR, the large value of the minimum augmented-strain (E_<min>) within BTR and no ductility-dip temperature range (DTR) at all, and that fully austenitic SUS 310S (JIS: 25Cr-20Ni type corresponding to AISI 310S) was the most susceptible to solidification and ductility-dip crackings due to the widest BTR and the smallest value of E_<min> within BTR and DTR. Furthermore, the effects of P and S on the hot crack susceptibility of SUS 304 and SUS 310S and then the effects of Si, Mn and C on the crack susceptibility of 25Cr-20Ni type alloy were studied. The decrease in P and Si contents was the most beneficial at present study to modify fully austenitic stainless steel 25Cr-2ONi type alloy and the addition of about 1% Mn was probably necessary to reduce cracking caused by the detrimental effect of S, as Mn has potency to combine with S. The increase in C content improved the tendency of ductility-dip and the addition of 0.53% C narrowed the BTR and raised the E_<min> within the BTR, therefore the weld metal may be resistant to hot cracking. However, the microstructure showed a considerable amount of eutectics with γ and M_7C_3 carbides.
- 大阪大学の論文
著者
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MATSUDA Fukuhisa
Osaka University
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KATAYAMA Seiji
Osaka University
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ARATA Yoshiaki
Osaka University
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Matsuda Fukuhisa
Osaka Univ.
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