热处理对锆合金管在纯水环境下腐蚀性能的影响  

Effect of Heat Treatment on Corrosion Resistance of Zr Alloy Tube in Pure Water Environment

作　　者：谢麒麟[1] 郑建聪 孙盼文 XIE Qiin;ZHENG Jiancong;SUN Panwen(Steel Pipe&Bar Business Depart.,Baoshan Iron&Steel Co.,Ltd.,Shanghai 201900,China)

机构地区：[1]宝山钢铁股份有限公司钢管条钢事业部,上海201900

出　　处：《钢管》2024年第3期13-18,共6页Steel Pipe

摘　　要：为评价反应堆燃料包壳用锆合金管在纯水环境下的腐蚀性能,研究不同热处理工艺对低锡低铌锆合金管的显微组织和腐蚀性能的影响。采用扫描电子显微镜和透射电子显微镜表征了合金的基体组织,并在高压釜中进行了360℃/18.6 MPa纯水环境下长达300 d的腐蚀试验。结果表明:低锡低铌锆合金管在550℃退火、保温5 h后的显微组织为完全再结晶状态,组织形貌为均匀的等轴晶组织,其第二相均匀地分布在晶粒中;而β相水淬+500℃退火、保温5 h后的合金是非完全再结晶的,其组织主要呈板条状。两种热处理温度下制备的低锡低铌锆合金在360℃/18.6 MPa高温高压水中的耐腐蚀性能均优于商用ZIRLO合金。In order to evaluate the corrosion resistance of the Zr alloy tube as used for the nuclear reactor fuel cladding in the pure water environment,the effects by different heat treatment processes on the microstructures and the corrosion re-sistance of the low Sn and low Nb Zr alloy tubes are studied.The matrix structure of the said alloy is characterized with the SEM and TEM.Moreover the corrosion test to the said alloy tube is also conducted in a hi-pressure autoclave under pure water condition at 360℃/18.6 MPa for so long as 300 days.The results reveal after annealed at 550℃and hold for 5 h,the microstructure of the tube is completely re-crystallized,and its microstructure morphology is of uniform equiaxed grain structure;and its second phase is evenly distributed in the grains;however,theβphase alloy tube as water quenched at 500℃and for 5 h is not completely re-crystallized,and its microstructure features mainly lamellar shape.The corrosion resistances under the conditions of hi-temperature as 360℃and high water pressure as 18.6 MPa are better than that of the commercial ZIRLO alloy.

关 键 词：锆合金管 热处理 腐蚀性能 显微组织 氧化膜 

分 类 号：TG146.414[一般工业技术—材料科学与工程] TG156[金属学及工艺—金属材料]