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首页> 外文期刊>ISIJ international >Estimation of Type Ⅳ Cracking Tendency in Power Plant Steels
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Estimation of Type Ⅳ Cracking Tendency in Power Plant Steels

机译：电厂钢Ⅳ型开裂倾向的估算

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摘要

A methodology has been developed which permits the estimation of the weakening of a ferritic creep-resistant steel as a result of welding and the associated Type Ⅳ phenomenon. The creep rupture strength of the base plate is first calculated as a function of its full chemical composition and heat treatment. The calculated value is then offset to allow for Type Ⅳ weakening following welding. It is likely that the magnitude of the offset decreases as the applied stress is reduced. The analysis involves a variety of steels and yet, the transition from plate failure to Type Ⅳ failure seems to occur at about 100 MPa. The basis of this transition needs to be investigated quantitatively. The scatter in the cross-weld data also seems large when compared with the case where failure is in the base plate; it is possible that this is because welding parameters (process, heat input etc.) and weld geometry (edge preparation) are not accounted for in the present work.
机译：已经开发出一种方法，该方法可以估算由于焊接和相关的Ⅳ型现象导致的铁素体抗蠕变钢的弱化。首先根据其全部化学成分和热处理来计算基板的蠕变断裂强度。然后将计算出的值进行补偿，以使焊接后的Ⅳ型强度减弱。随着施加应力的减小，偏移量的大小可能会减小。分析涉及多种钢，但是，从钢板破坏到Ⅳ型破坏的转变似乎发生在大约100 MPa的情况下。这种过渡的基础需要进行定量研究。与基板发生故障的情况相比，交叉焊接数据中的散点似乎也很大。这可能是因为在当前工作中未考虑焊接参数（工艺，热量输入等）和焊接几何形状（边缘准备）。

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