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| 热处理工艺对激光选区熔化AM247LC合金组织与性能的影响规律 |
| Effect of Heat Treatment on Microstructure and Mechanical Properties of AM247LC Alloy Processed by Selective Laser Melting |
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| DOI：10.3969/j.issn.1674-6457.2023.04.001 |
| 中文关键词: 热处理 激光选区熔化 组织调控 力学性能 AM247LC合金 |
| 英文关键词: heat treatment SLM microstructure regulation mechanical properties AM247LC alloy |
| 基金项目:国家自然科学基金(51871147) |
| Author Name | Affiliation | | LUO Hua | School of Materials Science and Engineering,Shanghai Key Laboratory of Advanced High Temperature Materials and Precision Forming,State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China | | ZHOU Wen-zhe | School of Materials Science and Engineering,Shanghai Key Laboratory of Advanced High Temperature Materials and Precision Forming,State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China | | TAN Qing-biao | School of Materials Science and Engineering,Shanghai Key Laboratory of Advanced High Temperature Materials and Precision Forming,State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China | | KONG De-cheng | School of Materials Science and Engineering,Shanghai Key Laboratory of Advanced High Temperature Materials and Precision Forming,State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China | | ZHU Guo-liang | School of Materials Science and Engineering,Shanghai Key Laboratory of Advanced High Temperature Materials and Precision Forming,State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China | | SHU Da | School of Materials Science and Engineering,Shanghai Key Laboratory of Advanced High Temperature Materials and Precision Forming,State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China | | DONG An-ping | School of Materials Science and Engineering,Shanghai Key Laboratory of Advanced High Temperature Materials and Precision Forming,State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China | | SUN Bao-de | School of Materials Science and Engineering,Shanghai Key Laboratory of Advanced High Temperature Materials and Precision Forming,State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China |
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| 中文摘要: |
| 目的 研究不同热处理制度对激光选区熔化(SLM)AM247LC合金微观组织和力学性能的影响规律。方法 对激光选区熔化制备的AM247LC合金分别进行900 ℃/16 h的直接时效热处理和1 210 ℃/30 min+ 1 050 ℃/30 min+950 ℃/16 h的固溶时效热处理，通过OM、SEM、EBSD、XRD等表征手段研究合金热处理前后的晶粒组织、碳化物及析出相等微观组织的变化，并对打印态及不同热处理态样品的室温拉伸性能进行测试，以表征热处理对其力学性能的影响行为。结果 打印态AM247LC合金中存在大量粗大柱状晶和细小晶粒组织;直接时效热处理(900 ℃/16 h)后的AM247LC合金晶粒组织与打印态类似，但析出了大量γ'强化相;固溶时效热处理(1 210 ℃/30 min+1 050 ℃/30 min+950 ℃/16 h)后，AM247LC合金发生了再结晶，形成大量退火孪晶，并且析出沿晶界分布非连续的微米级碳化物及大量γ'强化相。合金打印态的屈服强度为846.5 MPa，断裂伸长率可达19.6%;直接时效热处理后，合金屈服强度为1 042.8 MPa，断裂伸长率明显降低，仅为11.2%;固溶时效热处理后，合金屈服强度减小至767.8 MPa，但断裂伸长率提高到25.1%。结论 直接时效热处理有利于AM247LC合金室温强度的提高;固溶时效热处理会提高AM247LC的室温塑性;打印态AM247LC具有较为平衡的室温强度与塑性。 |
| 英文摘要: |
| The work aims to study the effect of heat treatment on the microstructure and mechanical properties of AM247LC alloy produced by selective laser melting (SLM). The AM247LC alloy prepared by selective laser melting was subject to direct aging heat treatment at 900 ℃/16 h and solution and aging heat treatment at 1 210 ℃/30 min+1 050 ℃/30 min+950 ℃/16 h, respectively. The changes of microstructure such as grain structure, carbide and precipitation before and after heat treatment were studied by OM, SEM, EBSD, etc., and the tensile properties of as-built samples and samples after different heat treatments were tested at room temperature to characterize the effect of heat treatment on their mechanical properties. The as-built AM247LC alloy had a large number of coarse columnar crystals and fine grains. The grain structure of AM247LC alloy after direct aging heat treatment (900 ℃/16 h) was similar to that of the as-built alloy, but a large number of γ' phases precipitated. After solution and aging heat treatment (1 210 ℃/30 min+1 050 ℃/30 min+950 ℃/16 h), recrystallization occurred in AM247LC alloy, forming a large number of annealed twins, and discontinuous micron-sized carbides along grain boundaries and a large number of γ' phases precipitated. The yield strength of the as-built alloy was 846.5 MPa, and the breaking elongation could reach 19.6%. After direct aging heat treatment, the yield strength was 1 042.8 MPa, and the breaking elongation was reduced to only 11.2%. After solution and aging heat treatment, the yield strength was reduced to 767.8 MPa, while the breaking elongation increased to 25.1%. Direct aging heat treatment is beneficial to improving the strength of AM247LC alloy. Solution and aging heat treatment can increase the plasticity of AM247LC. The as-built AM247LC has balanced strength and plasticity. |
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