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首页> 外文期刊>Materials at High Temperatures >Metallurgical investigation and modelling of deterioration of creep rupture strength in heat affected zone of heat resistant ferritic steel
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Metallurgical investigation and modelling of deterioration of creep rupture strength in heat affected zone of heat resistant ferritic steel

机译：耐热铁素体钢热影响区蠕变断裂强度劣化的冶金研究与建模

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摘要

Heat resistant ferritic steels containing 9-12% chromium have been widely used as materials such as the main steam pipes for fossil fired boilers in thermal power stations. In these steels, creep rupture strength of welded joints deteriorates compared with base metals. The fracture due to this phenomenon is called Type IV cracking. Although this phenomenon occurs in the fine-grained heat affected zone (HAZ) in welded joints and causes limitations of design stress in fossil-fired boilers, its mechanism is not yet perfectly understood. To clarify the mechanism of deterioration of creep rupture strength in HAZ of heat resistant ferritic steel, we have surveyed the affect of weld thermal cycle on the creep rupture strength and the microstructural change at high temperature. As a result, it is found that the creep rupture strength deteriorated in HAZ heated to a peak temperature near 1273 K, at which M_23C_6 type carbides are partially dissolved and the growth rate of fine particles is faster. The mechanism to explain this phenomenon is discussed from the viewpoint of the growth of precipitates, such as M_23C_6 and MX, during long-term heating.
机译：含9-12％铬的耐热铁素体钢已被广泛用作材料，例如火力发电厂中化石燃料锅炉的主蒸汽管。在这些钢中，与贱金属相比，焊接接头的蠕变断裂强度降低。由于这种现象而引起的断裂称为IV型裂纹。尽管此现象发生在焊接接头的细颗粒热影响区（HAZ）中，并导致化石锅炉的设计应力受到限制，但其机理尚未完全明了。为了阐明耐热铁素体钢热影响区中蠕变断裂强度劣化的机理，我们调查了焊接热循环对高温下的蠕变断裂强度和显微组织变化的影响。结果发现，在加热到1273K附近的峰值温度的HAZ中，蠕变断裂强度降低，在该温度下M_23C_6型碳化物被部分溶解并且细粒的生长速度更快。从长期加热过程中析出物（如M_23C_6和MX）的生长角度讨论了解释此现象的机理。

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