Abstract
This article deals with structural, fractographic and non-destructive analysis of a defective rotor made of 26NiCrMoV14-5 steel and assessment of possible technological failures resulting in the occurrence of cracking and subsequent defects. Metallographic analysis of the microstructure and evaluation of the steel metallographic purity were executed, including analysis of inclusions present and ultrasonic testing. Attention was paid to fractographic analysis of fracture areas. Degradation possibilities were monitored in relation to technological failures. The aim was to elucidate the cause of the rotor defect hindering its operational use.
Highlights
An important factor, indisputably affecting steel quality, is its metallurgical purity
Within the paper submitted, detailed material analysis was executed of the steam power plant rotor made of 26NiCrMoV14-5 steel
The aim was to assess the cause of its degradation
Summary
Indisputably affecting steel quality, is its metallurgical purity. Contamination of steel by excessive rate of inclusions constitutes a significant cause leading to initiation of degradation processes, and to the product deterioration [4 and 5]. At the bottom of the ladle, there is an eccentrically installed porous block on which an argon inlet is installed. This provides for steel flushing, setting it in vertical motion. In this way, the melt in the ladle is properly homogenized, inclusions flown out and the melt degassed simultaneously [6]. To check the internal product quality, ultrasonic and magnetic tests are stipulated for the final product
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