鉄鋼溶接部における硫化物の挙動と凝固割れ(第 7 報) : Fe-S-Mn-Mi および Fe-S-Mn-C 4 元系合金における硫化物と凝固割れ感受性

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Behaviour of sulphide and solidification crack susceptibility in TIG-arc weld metals of Fe-S-Mn-Ni and Fe-S-Mn-C quarternary alloys have been investigated. In these alloys the sulphur contents were purposefully somewhat higher than those encountered in commercial steels. Main conclusions obtained are as follows : 1) The addition of 2∿7% nickel or 0.2% carbon to the weld metals containing 1% manganese and 0.048∿0.086% sulphur not only causes the formation of filmlike sulphides (MnS) at the columnar grain boundaries, but also lowers the eutectic temperature at which the sulphides are formed. The increase in manganese content up to 2∿3%, however, prevents the formation of filmlike sulphides, and raise the eutectic temperature. 2) The solidification crack susceptibility, which is evaluated with Trans-Varestraint test, is increased at 1% manganese level with the increase in nickel or carbon content. The increase in manganese content up to 3%, however, lowers the susceptibility to the same degree as that of Fe-S-Mn ternary alloy whose Mn^3/S is larger than 6.7. 3) The general relationship between manganese and sulphur contents to prevent the detrimental effect of sulphur in Fe-S-Mn-Ni and Fe-S-Mn-C alloys is expected. That is, the relationship in which the solidification crack susceptibility is comparatively lowered is given as follows; Mn^5/S>310∿560 Moreover, the relationship in which the susceptibility is lowered to the same degree as that of Fe-S-Mn alloy whose Mn^3/S is larger than 6.7 is given as follows; Mn^5/S=2500∿3600
社団法人溶接学会の論文
1974-09-05

鉄鋼溶接部における硫化物の挙動と凝固割れ(第 7 報) : Fe-S-Mn-Mi および Fe-S-Mn-C 4 元系合金における硫化物と凝固割れ感受性

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