Solidification Analysis of Mod. 9Cr-1Mo Steel

Y. Yamamoto, H. Muto, Y. Akimoto, Shoitsu Seo, S. Ikeno
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引用次数: 2

Abstract

Modified 9Cr-1Mo steel has been applied to the parts of boiler in thermal power plants due to its excellent properties at high temperatures. In recent years, this steel also has been applied to the parts of turbine in ultra super critical power plants. Our company has been manufactured forged products by using large ingots of Mod.9Cr-1Mo steel that exceeded 20t for ten years or more, and it has been recognized that internal defects were liable to occur in Mod.9Cr-1Mo steel ingot. Especially the generation of the casting defects becomes more serious problem with the size of ingot,therefore measures were taken to improve the quality of forgings about both of ingot making and forging procedure. As a result of investigation of the defects in large Mod.9Cr-1Mo steel ingots, we concluded that defects formed in forgings were caused by casting defects and eutectic Nb (C,N). And the defect was proved to be influenced considerably by solidification rate and the cooling rate by means of solidification analysis that was performed because complete sticking of defect surface was difficult and the improvement of the steel ingot was necessary. Afterwards, large ingots were produced based on the analysis and the effectiveness of the analysis was confirmed by UT and the investigation of the microstructure. As mentioned above, we were able to raise quality and the stability of the product by improving the quality of the steel ingots.
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mod9cr - 1mo钢的凝固分析
改性9Cr-1Mo钢因其优异的高温性能,已广泛应用于火电厂锅炉部件。近年来,这种钢也被应用于超超临界电厂的涡轮部件。我公司使用超过20t的mod9cr - 1mo钢锭生产锻件已有十年以上的历史,并认识到mod9cr - 1mo钢锭容易出现内部缺陷。特别是随着铸锭尺寸的增大,铸件缺陷的产生日益严重,因此从铸锭制造和锻造工艺两方面采取了提高锻件质量的措施。通过对Mod.9Cr-1Mo大型钢锭缺陷的研究,得出锻件缺陷的形成是由铸造缺陷和共晶Nb (C,N)引起的。通过对缺陷表面不易完全粘接和钢锭改进的凝固分析,证明了缺陷受凝固速率和冷却速率的影响较大。随后,在此基础上生产了大型铸锭,并通过UT和显微组织研究证实了分析的有效性。如上所述,我们能够通过改善钢锭的质量来提高产品的质量和稳定性。
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