热处理对CMT电弧增材沉积Inconel 625合金组织与性能的影响
Effect of heat treatment on microstructure and properties of CMT arc additive deposited Inconel 625 alloy
蒋瑞鑫 1韩国峰 2牛宗伟 3王文宇 2黄湘远 4赵阳2
作者信息
- 1. 山东科技职业学院,山东潍坊 261053;山东理工大学机械工程学院,山东淄博 255000
- 2. 陆军装甲兵学院再制造技术国家重点实验室,北京 100072
- 3. 山东理工大学机械工程学院,山东淄博 255000
- 4. 陆军指挥学院作战实验室,江苏南京 210031
- 折叠
摘要
对CMT电弧增材沉积Inconel 625合金进行直接时效处理(720 ℃ × 8 h+620 ℃ × 8 h,空冷)和固溶处理(950、1000、1100、1200、1250 ℃ ×1 h,水冷),通过力学性能测试、电化学动电位极化测试、光学显微镜和场发射扫描电镜(SEM)及其自带的能谱分析仪(EDS)分析了不同热处理工艺对沉积态Inconel 625合金组织与性能的影响.结果表明,时效处理对沉积态合金组织中Laves相影响不明显;随固溶温度升高,组织由沉积态树枝晶转变为等轴晶,有害相Laves相溶解消失.时效处理可显著提升合金的硬度和抗拉强度,相较于沉积态硬度和抗拉强度分别提升35.1 HV0.5和176.4 MPa,但塑性降低;1200℃固溶处理能够明显提升合金的塑性,较沉积态断裂总延伸率提升49.6％.时效处理对合金的耐蚀性影响不明显;1200 ℃固溶处理可显著提高合金的耐蚀性,较沉积态自腐蚀电位提高22.8％,自腐蚀电流密度降低46.9％.
Abstract
Direct aging treatment(720 ℃ ×8 h+620 ℃ ×8 h,air cooling)and solution treatment(950,1000,1100,1200,1250 ℃ ×1 h,water cooling)were conducted on the Inconel 625 alloy arc additive deposited by CMT(cold metal transfer).The effects of different heat treatment processes on the microstructure and properties of the deposited Inconel 625 alloy were analyzed by mechanical properties test,electrochemical potentiodynamic polarization test,optical microscope,field emission scanning electron microscope(SEM)and EDS.The results show that the effect of aging treatment on the Laves phase in the deposited alloy is not obvious.As the solution treatment temperature increases,the microstructure changes from deposited dendrites to equiaxed grains,and the harmful Laves phase dissolves and disappears.Aging treatment can significantly improve the hardness and tensile strength of the alloy,compared with that of the deposited state,the hardness and tensile strength are increased by 35.1 HV0.5 and 176.4 MPa,respectively,but the plasticity is reduced.Solution treatment at 1200 ℃ can significantly improve the plasticity of the alloy,compared with that of the deposited state,the percentage total extension at fracture is increased by 49.6％.Aging treatment has no obvious effect on the corrosion resistance of the alloy,but solution treatment at 1200 ℃ can significantly improve the corrosion resistance of the alloy as the self-corrosion potential increased by 22.8％and the self-corrosion current density reduced by 46.9％compared with that of the deposited state.
关键词
Inconel/625合金/热处理/组织/力学性能/耐蚀性能Key words
Inconel 625 alloy/heat treatment/microstructure/mechanical properties/corrosion resistance引用本文复制引用
基金项目
国家重点研发项目(2018YFB1105800)
出版年
2024
NETL
NSTL
万方数据