鋯合金氧化膜中橫向裂紋產(chǎn)生影響因素的研究綜述

鋯合金氧化膜中橫向裂紋產(chǎn)生影響因素的研究綜述Review on influencing factors of lateral cracks formation in oxide of zirconium alloys

鋯合金腐蝕動(dòng)力學(xué)轉(zhuǎn)變現(xiàn)象對(duì)鋯合金燃料包殼管的使用壽命起決定性作用，而橫向裂紋的產(chǎn)生是發(fā)生腐蝕動(dòng)力學(xué)轉(zhuǎn)變現(xiàn)象的主要原因之一。迄今為止，對(duì)鋯合金氧化膜中橫向裂紋產(chǎn)生影響因素仍沒有系統(tǒng)的研究。從橫向裂紋產(chǎn)生的本質(zhì)出發(fā)，討論鋯合金的基體力學(xué)性能、第二相粒子、氧化膜中的四方相氧化鋯以及合金元素4個(gè)因素對(duì)鋯合金氧化膜中橫向裂紋產(chǎn)生的影響，揭示橫向裂紋產(chǎn)生的驅(qū)動(dòng)力以及裂紋形核的原因。同時(shí)指出對(duì)這4個(gè)因素的深入研究，有助于減少氧化膜中橫向裂紋的產(chǎn)生，進(jìn)一步增強(qiáng)鋯合金的耐腐蝕性能。

The corrosion kinetics transition phenomenon of zirconium alloys has decisive effect on the service life of nuclear zirconium fuel tubes. The lateral cracks in the oxide of zirconium alloy are the principal cause of corrosion kinetics transition. By far, there is no systematical study on the factors which affecting the production of lateral cracks. Based on the nature of formation of lateral cracks, the influences of mechanical properties of matrix, second phase particles, tetragonal zirconia in oxide and alloying elements on corrosion transition phenomenon were discussed, and the driving force for the formation of lateral cracks and the reasons for nucleation regions of cracks were revealed. It is pointed out that deeply investigate on these four factors could contribute to decrease the production of lateral cracks in oxide and enhance the corrosion resistance of zirconium alloys.

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