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首页> 外文会议>International Conference on Trends in Welding Research >Evaluation of solidification cracking susceptibility of stainless steels using extra high-purity steels for ferrite-free welding
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Evaluation of solidification cracking susceptibility of stainless steels using extra high-purity steels for ferrite-free welding

机译：不锈钢凝固裂解敏感性使用超高纯度对铁氧体焊接的凝固裂缝敏感性

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摘要

Solidification cracking susceptibility of extra high-purity type 304 and 316 stainless steels was evaluated by the transverse-Varestraint test using arc and laser welding, in order to clarify the feasibility of ferrite-free welding. The solidification brittle temperature ranges (BTRs) of 304EHP and 316EHP steels were slightly increased with a decrease in the amount of 8-ferrite in the weld metal, while they were considerably lower than those of commercial-purity steels with FA solidification mode during arc as well as laser welding. It follows that the ferrite-free welding of austenitic stainless steels could be accomplished by applying the extra high-purity steels. Theoretical approach to the BTR was made to elucidate the depression mechanism of solidification cracking susceptibility in extra high-purity steels. From the fact that solidification segregation of minor and impurity elements such as C, P and S was considerably depressed in the extra high-purity weld metal, the solidification cracking susceptibility would be reduced even when the amount of ferrite was extremely small or free, due to the inhibition of solidification segregation. Numerical analysis of the BTR suggested that the ferrite-free welding of type 304 and 316 stainless steels could be achieved at the compositional range of P+S+0.1C<80ppm in the weld metal.
机译：凝固裂纹额外高纯度型304和316个不锈钢的易感性通过使用电弧和激光焊接横向可变拘束试验评价中，为了澄清游离铁素体焊接的可行性。 304EHP和316EHP钢的凝固脆性温度范围（BTRs）与在焊缝金属中的8铁素体的量的减少被稍微增加，而他们大大比那些具有FA凝固模式商业纯度钢的电弧作为期间降低以及激光焊接。由此可见，奥氏体不锈钢的游离铁素体焊接可以通过将额外的高纯度钢来实现。到BTR理论方法是为了阐明凝固在超高纯度钢裂纹敏感性的抑郁机制。一个事实，即次要和杂质元素如C，P和S的凝固偏析在额外的高纯度焊接金属也大大压下时，凝固裂纹敏感性将即使当铁素体量是非常小的或免费的，由于降低了凝固偏析的抑制。的BTR的数值分析表明，304型和316个不锈钢的游离铁素体焊接可以在P + S + 0.1C <80ppm的焊接金属的组成范围来实现。

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