β相水淬对Zr-4合金在LiOH水溶液中耐腐蚀性能的影响  

EFFECT OFβ-QUENCHING ON THE CORROSION RESISTANCE OF Zr-4 ALLOY IN LiOH AQUEOUS SOLUTION

作　　者：沈月锋[1] 姚美意[1,2] 张欣[1] 李强[1,2] 周邦新[1,2] 赵文金[3] 

机构地区：[1]上海大学材料研究所,上海200072 [2]上海大学微结构重点实验室,上海200444 [3]中国核动力研究设计院核燃料及材料国家级重点实验室,成都610041

出　　处：《金属学报》2011年第7期899-904,共6页Acta Metallurgica Sinica

基　　金：国防科技重点实验室基金项目9140C70040108C70;国家自然科学基金项目50971084;国家高新技术研究发展计划项目2008AA031701;上海市自然科学基金项目09ZR1411700;上海市重点学科建设项目S30107资助~~

摘　　要：采用β相水淬处理后再经480-600℃保温2-200 h的工艺,研究了β相水淬对Zr-4合金在360℃/18.6 MPa和0.01 mol/L LiOH水溶液中腐蚀行为的影响;用TEM和HRSEM分别观察了合金的显微组织和氧化膜断口形貌.结果表明:β相水淬时控制合适的冷却速率,避免残留β-Zr的生成,提高固溶在α-Zr基体中Fe和Cr含量,Zr-4合金也可获得与Zr-Sn-Nb合金一样优良的耐腐蚀性能.但当β相水淬速率过快时,由于残留β-Zr的存在使Zr-4合金的耐腐蚀性能降低;而随后进行480-600℃退火处理,随着退火温度的升高和退火时间的延长,β相水淬快冷样品的耐腐蚀性能得到明显改善,这主要与残留β-Zr的分解有关.To investigate the effect of β-quenching on the corrosion behavior, Zr-4 specimens were β-quenched and subsequently annealed at 480--600 ℃ for 2--200 h. The corrosion tests were carried out in 0.01 mol/L LiOH aqueous solution at 360 ℃/18.6 MPa. The microstructure of Zr-4 specimens and fracture surface morphology of oxide films on the corroded specimens were observed by TEM and HRSEM, respectively. The results show that Zr-4 specimens exhibit excellent corrosion resistance as Zr-Sn-Nb alloys in LiOH aqueous solution after increasing the solid solution content of Fe and Cr in β-Zr matrix by suitable quenching rate from/β-phase to avoid the formation of β-Zr. When the cooling rate is too fast, the specimens show worse corrosion resistance due to the formation of β-Zr. After annealing at 480--600 ℃, the better corrosion resistance of Zr-4 specimens can be obtained with increasing annealing temperture and time due to the decomposition ofβ-Zr. KEY WORDS Zr-4 alloy, corrosion resistance,β-quenching

关 键 词：ZR-4合金 耐腐蚀性能 p相水淬 

分 类 号：TL341[核科学技术—核技术及应用]