Al含量提高对IN 617合金持久性能及组织稳定性的影响
Effect of increasing Al content on creep rupture performance and microstructure stability of IN 617 alloy
任利国 1白亚冠 1聂义宏 2杨晓禹 2王大鹏 3白兴红 3彭亚敏 3傅万堂4
作者信息
- 1. 亚稳材料制备技术与科学国家重点实验室,燕山大学材料科学与工程学院,河北秦皇岛 066004;天津重型装备工程研究有限公司,天津 300457;黑龙江省高端核电装备智能制造重点实验室,黑龙江齐齐哈尔 161042
- 2. 天津重型装备工程研究有限公司,天津 300457;黑龙江省高端核电装备智能制造重点实验室,黑龙江齐齐哈尔 161042
- 3. 天津重型装备工程研究有限公司,天津 300457
- 4. 亚稳材料制备技术与科学国家重点实验室,燕山大学材料科学与工程学院,河北秦皇岛 066004
- 折叠
摘要
采用高温持久实验、扫描电镜(SEM)及透射电镜(TEM)等研究了 Al含量提高对IN 617合金持久性能及组织稳定性的影响.结果表明:Al含量提高后,基于超过4万小时的实验数据,IN 617合金700 ℃、10万小时的外推持久强度超过170 MPa,持久性能显著提高,合金的持久断裂机制仍以微孔聚集长大为主;Al含量的提高会明显促进IN 617合金中γ'相的析出,提高其含量,同时也会促进合金中µ相和σ相等TCP相(Topologically close-packed phases)的析出,从而提高合金的硬度与持久性能,但尚未发现TCP相会对合金持久强度产生不利影响;时效处理时间越长,晶界析出相尺寸越大且愈加连续,致使晶界结合强度降低,而Al含量的提高又会提高晶内强度.二者共同作用,会使IN 617合金的持久塑性降低.
Abstract
Effect of increasing Al content on creep rupture performance and microstructure stability of IN 617 alloy was studied using high-temperature rupture experiments,scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The results show that after increasing the Al content,based on experimental data of over 40000 h,the extrapolated creep rupture strength of the IN 617 alloy exceeds 170 MPa at 700 ℃ and 100000 h,the creep rupture performance is significantly improved,and the creep rupture fracture mechanism of the alloy is still dominated by the accumulation and growth of micropores.The increase of Al content will significantly promote the precipitation of γ'phase in the IN 617 alloy,increase its content,and also promote the precipitation of TCP phases(Topologically close-packed phases)such as µ phase and σ phase in the alloy,thereby improving the hardness and creep rupture performance of the alloy.However,it has not been found that the TCP phases have an adverse effect on the creep rupture strength of the alloy.The longer the aging treatment time,the larger and more continuous the size of grain boundary precipitates,resulting in a decrease in the bonding strength of grain boundaries,while an increase in Al content will increase the intragranular strength.The combined effect of the two will reduce the creep rupture plasticity of the IN 617 alloy.
关键词
IN/617合金/Al含量/持久性能/组织稳定性/析出相Key words
IN 617 alloy/Al content/creep rupture performance/microstructure stability/precipitate phase引用本文复制引用
基金项目
国家重点研发计划(2021YFB3704102)
2021年国家新材料应用示范平台项目(TC210H022)
黑龙江省自然科学基金(JQ2021E007)
出版年
2024
NETL
NSTL
万方数据