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利用静态高压釜腐蚀实验研究了β相处理时冷却速率对Zr-4合金板状样品在500℃/10.3 MPa过热蒸汽中耐疖状腐蚀性能的影响。结果表明:β相处理时,随着冷却速率的降低,Zr(Fe,Cr)_2第二相会明显沿α-Zr板条晶界上析出,降低了过饱和固溶在α-Zr中的Fe和Cr含量,使得样品经过冷轧和再结晶退火后的耐疖状腐蚀性能变差。对比研究了工业生产中Zr-4合金板材耐疖状腐蚀性能不均匀的样品,认为出现这种现象与板坯在进行β相淬火时,由于尺寸较大各处的冷却速率不均匀有关。
The static autoclave corrosion experiment was used to study the effect of cooling rate on the corrosion resistance of Zr-4 alloy plate under 500 ℃ / 10.3 MPa superheated steam. The results show that the second phase of Zr (Fe, Cr) _2 precipitates along the grain boundaries of α-Zr lamellae with the decrease of cooling rate during the β-phase treatment, reducing the supersaturation and solid solution in α-Zr Fe and Cr content, making the sample after cold-rolled and recrystallization annealed after the corrosion-like corrosion resistance deterioration. Comparative studies on the non-uniform corrosion resistance of Zr-4 alloy sheet in industrial production show that this phenomenon is related to the non-uniform cooling rate of the larger size slab during beta phase quenching.