【摘要】 将N36锆合金样品分别进行1020℃/20minWQ+C.R.+580℃/50hAC、820℃/2hAC+580℃/50hAC、820℃/2hAC+C.R.+580℃/50hAC、700℃/4hAC+C.R.+580℃/50hAC4种不同的热处理.用透射电镜观察了它们的显微组织,用高压釜腐蚀试验研究了它们在400℃/10.3MPa过热水蒸气中的腐蚀与吸氢行为.结果表明:经1020℃/20minWQ+C.R.+580℃/50hAC处理后样品的耐腐蚀性能最好,其原因在于合金中第二相细小弥散分布在晶界及晶内;而经820℃/2hAC+580℃/50hAC处理后样品的耐腐蚀性能最差,第二相主要集中在晶界上,且比较粗大.经820℃/2hAC+C.R.+580℃/50hAC、700℃/4hAC+C.R.+580℃/50hAC处理的样品的腐蚀性能介于两者之间.热处理对N36锆合金腐蚀时的吸氢行为有一定的影响,但不如对Zr-4合金的影响大,这可能是因为N36锆合金中的第二相吸氢能力不如Zr-4合金中的Zr(Fe,Cr)2第二相强的缘故.更多还原

【Abstract】 N36 zirconium alloy specimens were treated in different ways at 1 020 °C /20 min WQ + C.R. （cold rolling） + 580 °C/50 h AC, 820 °C /2 h AC+ 580 °C /50 h AC, 820 °C /2 h AC+ C.R.+580 °C /50 h AC, and 700 °C /4 h AC+C.R.+ 580 °C /50 h AC, respectively. Their microstructures were examined by transmission electron microscopy （TEM）. The corrosion and hydrogen uptake behaviors of these specimens were investigated after autoclave tests in superheated steam at 400 °C /10.3 MPa. Results show that the corrosion resistance of the specimen treated at 1 020 °C /20 min WQ+C.R. （cold rolling）+ 580 °C /50 h AC is the best among them. The reason is that such treatment makes the second phase particles fine and dispersed in α-Zr matrix. The corrosion resistance of the specimen treated at 820 °C /2 h AC+ 580 °C /50 h AC was the worst due to the presence of coarse second phase particles. The corrosion resistance of these specimens treated at 820 °C /2 h AC+C.R.+580 °C /50 h AC and 700 °C /4 h AC+C.R. +580 °C /50 h AC is in between. Heat treatments have less influence on hydrogen uptake of N36 than that of Zr-4. This may be the reason that the second phase particles in N36 alloy is less reactive with hydrogen than that of Zr（Fe,Cr）₂ SPPs in Zr-4.更多还原