含铒5E83合金热轧板稳定化工艺研究

Study on Stabilization Process of Er-containing 5E83 Alloy Hot Rolled Sheet

研究了含铒5E83合金热轧板不同退火态敏化前后的力学性能及腐蚀性能,采用OM、EBSD及TEM对典型退火态合金的微观组织进行分析。结果表明:热轧板经100℃退火168 h敏化处理后对晶间腐蚀敏感,热轧板具有较差的耐长期腐蚀性。经退火后,含铒5E83合金热轧板力学性能下降,敏化前后的腐蚀性能均随退火时间延长而改善,综合考虑力学性能及腐蚀性能,优化出稳定化工艺为260℃退火16 h。经260℃/16 h退火后,热轧板敏化前后失重均低于15 mg/cm,即具有良好的耐长期晶间腐蚀性能。经260℃退火16 h敏化后,热轧板透射组织中的晶界处未发现有连续的β相(AlMg)析出。因此,热轧板经260℃退火16 h后,具有良好的耐长期晶间腐蚀性能。

The mechanical properties and corrosion properties of Er-containing 5E83 alloy hot rolled plate before and after different annealing state sensitization were studied.The microstructure of typical annealed alloy was analyzed by OM,EBSD and TEM.The results show that the hot rolled sheet is sensitive to intergranular corrosion after 100℃annealing for 168 h sensitization treatment.The hot rolled sheet has poor long-term corrosion resistance.After annealing,the mechanical properties of hot-rolled 5E83 alloy with hot-rolled alloy decrease.Corrosion properties before and after sensitization are improved with prolonged annealing time.The stabilization process is optimized at 260℃annealing for 16 h considering the mechanical and corrosion properties.When annealed at 260℃/16 h,the weight loss of hot rolled sheet before and after sensitization is less than 15 mg/cm~2,which is good for long-term intergranular corrosion resistance.No continuousβphase(AlMg)precipitates are found at the grain boundary in the transmission structure of hot rolled sheet after annealing at 260℃for 16 h sensitization.Therefore,the hot rolled sheet has good resistance to long-term intergranular corrosion after annealing at 260℃for 16 h.