Effects of Solution Aging on Microstructural Evolution and Mechanical Properties of Laser Deposition Repairing ZM6 Alloy
Received date: 2023-08-10
Revised date: 2023-12-07
Online published: 2024-02-27
Supported by
National Key Research and Development Program of China(2022YFE0122600);China Aero Engine Group Industry University Research Cooperation Project(HFZL2021CXY025-1);Liaoning Province Department of Education Fund(JYT2020061);Open Fund of Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process of Shenyang Aerospace University(SHSYS202001)
ZM6 (Mg-Nd-Zn-Zr) alloy is a typical casting magnesium alloy with low density, high specific strength and stiffness, good vibration damping performance, good machinability, and good heat resistance. It is widely used in aerospace and aviation fields. However, metallurgical or machining defects are inevitable while processing due to the complicated shapes and large scales of aviation components. Failure to repair them may lead to significant economic loss. Laser deposition repair can be applied to aerospace components because of the advantages of small heat input and high molding accuracy. This work focuses on repairing the aerospace ZM6 magnesium alloy components using laser deposition, addressing the metallurgical defects and service damage to the components. The changes in the microstructure and mechanical properties of the repaired ZM6 samples before and after solution aging (T6: 520 oC, 8 h + 220 oC, 14 h) treatment were compared. The results show that the microstructure of the repaired zone of the as-deposited sample consists of fine α-Mg grains. The secondary phases distributed mainly at grain boundaries showed a continuous network, and a small number of the dot- and rod-shaped secondary phases were distributed inside Mg grains. The average hardness of the repaired zone is (60 ± 2) HV0.1, and the tensile strength, yield strength, and elongation were 137.47 MPa, 111.61 MPa, and 5.57%, respectively. The fracture occurred in the base metal, and the tensile fracture mode comprised transgranular and intergranular brittle fractures. After T6 treatment, the microstructure of the repaired zone comprised fine α-Mg grains and abnormally coarse grains, and β′ phase was precipitated inside the grains. The average hardness of the repaired zone increased by 17.5% compared to that of the as-deposited samples, and the abnormally coarse and fine grains led to various hardness fluctuations. The tensile strength and yield strength of the T6-treated samples increased by 49.8% and 75.6%, respectively, but the elongation decreased. The fracture location of the tensile sample was in the repaired zone because of the formation of abnormally coarse grains.
QIN Lanyun , ZHANG Jian , YI Junzhen , CUI Yanfeng , YANG Guang , WANG Chao . Effects of Solution Aging on Microstructural Evolution and Mechanical Properties of Laser Deposition Repairing ZM6 Alloy[J]. Acta Metall Sin, 2025 , 61(6) : 875 -886 . DOI: 10.11900/0412.1961.2023.00330
| 1 | Song J F, She J, Chen D L, et al. Latest research advances on magnesium and magnesium alloys worldwide [J]. J. Magnes. Alloy., 2020, 8: 1 |
| 2 | Xu T C, Yang Y, Peng X D, et al. Overview of advancement and development trend on magnesium alloy [J]. J. Magnes. Alloy., 2019, 7: 536 |
| 3 | Yang Y, Xiong X M, Chen J, et al. Research advances in magnesium and magnesium alloys worldwide in 2020 [J]. J. Magnes. Alloy., 2021, 9: 705 |
| 4 | Song B, Zhang J L, Zhang Y J, et al. Research progress of materials design for metal laser additive manufacturing [J]. Acta Metall. Sin., 2023, 59: 1 |
| 宋 波, 张金良, 章媛洁 等. 金属激光增材制造材料设计研究进展 [J]. 金属学报, 2023, 59: 1 | |
| 5 | Wu G H, Wang C L, Sun M, et al. Recent developments and applications on high-performance cast magnesium rare-earth alloys [J]. J. Magnes. Alloy., 2021, 9: 1 |
| 6 | Tang W N, Mo N, Hou J, et al. Research progress of additively manufactured magnesium alloys: A review [J]. Acta Metall. Sin., 2023, 59: 205 |
| 唐伟能, 莫 宁, 侯 娟. 增材制造镁合金技术现状与研究进展 [J]. 金属学报, 2023, 59: 205 | |
| 7 | Cheng B, Mao C, Zhang M J, et al. Comparative study on microstructure and properties of laser welding and argon arc welding Hastelloy C-276/SS304 with filler wire [J]. Opt. Laser Technol., 2023, 164: 109565 |
| 8 | Ci S W, Liang J J, Li J G, et al. Microstructure and tensile properties of DD32 single crystal Ni-base superalloy repaired by laser metal forming [J]. J. Mater. Sci. Technol., 2020, 45: 23 |
| 9 | Lin X, Cao Y Q, Wu X Y, et al. Microstructure and mechanical properties of laser forming repaired 17-4PH stainless steel [J]. Mater. Sci. Eng., 2012, A553: 80 |
| 10 | Smail B S, Cailloux T, Quinsat Y, et al. Integrated approach to stainless steel 316L parts repair for pitting corrosion using laser metal deposition [J]. J. Manuf. Processes, 2023, 95: 1 |
| 11 | Yan W G, Zeng W, Man J X, et al. Microstructure and mechanical properties of a directionally solidified superalloy DZ411 plate sample repaired by laser melting deposition [J]. Mater. Sci. Eng., 2023, A876: 145141 |
| 12 | Wang Z D, Yang K, Chen M Z, et al. Investigation of the microstructure and mechanical properties of Ti-6Al-4V repaired by the powder-blown underwater directed energy deposition technique [J]. Mater. Sci. Eng., 2022, A831: 142 |
| 13 | Qin L Y, Pang S, Yang G, et al. Microstructure and micro-hardness of laser deposition repair ZL114A aluminum alloy [J]. Infrared Laser Eng., 2017, 46: 0506004 |
| 钦兰云, 庞 爽, 杨 光 等. 激光沉积修复ZL114A铝合金的显微组织及显微硬度研究 [J]. 红外与激光工程, 2017, 46: 0506004 | |
| 14 | Peng L M, Deng Q C, Wu Y J, et al. Additive manufacturing of magnesium alloys by selective laser melting technology: A review [J]. Acta Metall. Sin., 2023, 59: 31 |
| 彭立明, 邓庆琛, 吴玉娟 等. 镁合金选区激光熔化增材制造技术研究现状与展望 [J]. 金属学报, 2023, 59: 31 | |
| 15 | Dai J, Huang J, Li M, et al. Effects of heat treatments on laser welded Mg-rare earth alloy NZ30K [J]. Mater. Sci. Eng., 2011, A529: 401 |
| 16 | Singh K. Effect of post-welding heat treatment on mechanical and microstructural properties of friction stir welded dissimilar magnesium alloys [J]. Mater. Today Proc., 2023, doi: 10.1016/j.matpr.2023.02.133 |
| 17 | Tong X, Zhang G, Wu G H, et al. Addressing the abnormal grain coarsening during post-weld heat treatment of TIG repair welded joint of sand-cast Mg-Y-RE-Zr alloy [J]. Mater. Charact., 2021, 176: 111125 |
| 18 | Zhang G Q, Tong X, Wu G H, et al. Research on the post-weld heat treatment of TIG repair welded joint of sand-cast Mg-Y-RE-Zr alloy [J]. Mater. Sci. Eng., 2021, A821: 141577 |
| 19 | Yang G, Zhang W Q, Zhang J, et al. Evolution of microstructure of WE43 magnesium alloys fabricated by laser deposition manufacturing with subsequent friction stir processing [J]. Mater. Lett., 2023, 330: 133218 |
| 20 | Jiao X Y, Li X J, Zhan L Q, et al. The Microstructural evolution and grain growth kinetics of fine-grained extruded Mg-Nd-Zn-Zr alloy [J]. Materials (Basel), 2022, 15: 3556 |
| 21 | Ning Z L, Cao F Y, Liu H H, et al. Microstructure analysis of Mg-2.54Nd-0.26Zn-0.32Zr alloy [J]. Rare. Met. Mater. Eng., 2009, 38: 1997 |
| 宁志良, 曹福洋, 刘洪汇 等. Mg-2.54Nd-0.26Zn-0.32Zr合金组织分析 [J]. 稀有金属材料与工程, 2009, 38: 1997 | |
| 22 | Ning Z L, Liu H H, Cao F Y, et al. The effect of grain size on the tensile and creep properties of Mg-2.6Nd-0.35Zn-xZr alloys at 250 °C [J]. Mater. Sci. Eng., 2013, A560: 163 |
| 23 | Gao M, Wang H K, Hao K D, et al. Evolutions in microstructure and mechanical properties of laser lap welded AZ31 magnesium alloy via beam oscillation [J]. J. Manuf. Processes, 2019, 45: 92 |
| 24 | Lei Z L, Bi J, Li P, et al. Analysis on welding characteristics of ultrasonic assisted laser welding of AZ31B magnesium alloy [J]. Opt. Laser Technol., 2018, 105: 15 |
| 25 | Harooni M, Carlson B, Strohmeier B R, et al. Pore formation mechanism and its mitigation in laser welding of AZ31B magnesium alloy in lap joint configuration [J]. Mater. Des., 2014, 58: 265 |
| 26 | Fu P H, Peng L M, Jiang H Yet al. Effects of heat treatments on the microstructures and mechanical properties of Mg-3Nd-0.2Zn-0.4Zr (wt.%) alloy [J]. Mater. Sci. Eng., 2008, A486: 183 |
| 27 | Chen R N, Chen Q H, Peng P, et al. Abnormal grain growth induced by <1120> orientation of AZ31 magnesium alloy [J]. Mater. Sci. Technol., 2023, 39: 1337 |
| 28 | Pei R S, Korte-Kerzel S, Al-Samman T. Normal and abnormal grain growth in magnesium: Experimental observations and simulations [J]. J. Mater. Sci. Technol., 2020, 50: 257 |
| 29 | Tang J W, Chen L, Li Z G, et al. Formation of abnormal coarse grains and its effects on corrosion behaviors of solution treated ZK60 Mg alloy [J]. Corros. Sci., 2021, 180: 109201 |
| 30 | Kim H J, Jin S C, Jung J G, et al. Influence of undissolved second-phase particles on dynamic recrystallization behavior of Mg-7Sn-1Al-1Zn alloy during low- and high-temperature extrusions [J]. J. Mater. Sci. Technol., 2021, 71: 87 |
| 31 | Lezaack M B, Simar A. Avoiding abnormal grain growth in thick 7XXX aluminium alloy friction stir welds during T6 post heat treatments [J]. Mater. Sci. Eng., 2021, A807: 140901 |
| 32 | Zheng D D, Li Z, Jiang Y L, et al. Effect of multiple thermal cycles on the microstructure evolution of GA151K alloy fabricated by laser-directed energy deposition [J]. Addit. Manuf., 2022, 57: 102957 |
| 33 | Qin L Y, Pang S, Yang G, et al. Microstructure and mechanical property analysis of ZL114A aluminum alloy repaired by laser deposition [J]. Infrared Laser Eng., 2016, 43: 108 |
| 钦兰云, 庞 爽, 杨 光 等. 激光沉积修复ZL114A铝合金组织和力学性能分析 [J]. 中国激光, 2016, 43: 108 | |
| 34 | Zheng R X, Du J P, Gao S, et al. Transition of dominant deformation mode in bulk polycrystalline pure Mg by ultra-grain refinement down to sub-micrometer [J]. Acta Mater., 2020, 198: 35 |
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