热处理工艺对深海油气开采用UNS N07718高温合金性能及微观组织的影响  

Effect of Heat Treatment Process on Properties and Microstructure of UNS N07718 Superalloy for Deep-sea Oil and Gas Development

作　　者：刘恒 罗锐[1] 钱喜根 孙希 赵钦兰 崔力云 杨程 丁恒楠 LIU Heng;LUO Rui;QIAN Xigen;SUN Xi;ZHAO Qinlan;CUI Liyun;YANG Cheng;DING Hengnan(School of Materials Science and Engineering,Jiangsu University,Jiangsu Zhenjiang 212013,China;School of Agricultural Engineering,Jiangsu University,Jiangsu Zhenjiang 212013,China;Jiangsu Fujie High-end Equipment Manufacturing(Group)Co.,Ltd.,Jiangsu Suzhou 215233,China)

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]江苏大学农业工程学院,江苏镇江212013 [3]江苏孚杰高端装备制造(集团)股份有限公司,江苏苏州215233

出　　处：《精密成形工程》2024年第10期98-106,共9页Journal of Netshape Forming Engineering

基　　金：江苏省自然科学基金(BK20220548);高端装备机械传动全国重点实验室开放基金(SKLMT-MSKFKT-202219);新金属材料国家重点实验室开放基金(2022-Z21);黑龙江省先进摩擦焊技术与装备重点实验室开放基金(HWI-003)。

摘　　要：目的研究经过不同热处理后深海油气开采用UNS N07718的显微组织和室温、低温力学性能变化,获得适合工业生产的最佳热处理参数。方法根据石油行业API 6ACRA规范要求,采用不同固溶热处理参数来对比UNS N07718高温合金显微组织变化,再经过不同的时效热处理工艺,通过室温拉伸试验、硬度试验和低温冲击试验来对比综合热处理对材料力学性能的影响。结果1040℃固溶温度的晶粒尺寸明显大于1025℃的晶粒尺寸,这主要是由于δ析出相的完全回溶,降低了对晶界的钉扎作用,导致晶粒急剧长大。当固溶温度在1025℃以上时,随保温时间的延长和固溶温度的增加,晶粒增大,材料的屈服强度、抗拉强度、断面收缩率以及硬度性能降低,其中当晶粒度为6级时,对应的屈服和硬度分别为1010 MPa和365HBW。时效温度对材料的屈服强度和断面收缩率以及硬度、低温冲击韧性影响非常明显,在时效温度775~795℃范围内,随着时效温度的升高,屈服强度和断面收缩率呈下降趋势。同时,当时效时间在6.5~8 h内改变时,对性能的影响并不明显。结论获得了UNS N07718高温合金热处理性能参数,可用于指导深海油气开采用UNS N07718高温合金实际热处理操作。The work aims to study the changes in the microstructure and mechanical properties of UNS N07718 at room temperature and low temperature after different heat treatments in deep-sea oil and gas production,and to obtain the best heat treatment parameters suitable for industrial production.According to the requirements of API 6ACRA Specification in the petroleum industry,different solution heat treatment parameters were used to compare the microstructural changes of UNS N07718 superalloy.The effects of comprehensive heat treatment on the mechanical properties of the materials were compared by room temperature tensile test,hardness test and low temperature impact test.The grain size at 1040℃solution temperature was significantly larger than that at 1025℃,which was mainly due to the complete dissolution of theδprecipitated phase,which reduced the pinning effect on the grain boundary and led to a rapid growth of grains.At above 1025℃,with the extension of holding time and the increase of solution temperature,the yield strength,tensile strength,section shrinkage and hardness properties of the material were reduced due to the increase of grain size.The aging temperature had a significant effect on the yield strength and section shrinkage of the material,as well as the hardness and low-temperature impact toughness.When the aging temperature was in the range of 775-795℃,the yield strength and section shrinkage showed a downward trend with the increase of aging temperature.At the same time,the change of aging time in the range of 6.5-8 h had no obvious effect on the performance.The heat treatment performance parameters of UNS N07718 superalloy are obtained,which can be used to guide the actual heat treatment operation of UNS N07718 in deep-sea oil and gas development.

关 键 词：UNSN07718高温合金 固溶处理 时效处理 微观组织 室温拉伸 低温冲击 

分 类 号：TG156.1[金属学及工艺—热处理]