姜沐池,任德春,赵晓彧,蔡雨升,吉海宾,雷家峰,杨锐.激光扫描速度对Ti-Ni形状记忆合金组织和性能影响[J].稀有金属材料与工程,2023,52(4):1455~1463.[Jiang Muchi,Ren Dechun,Zhao Xiaoyu,Cai Yusheng,Ji Haibin,Lei Jiafeng,Yang Rui.Effects of Laser Additive Manufacturing Parameters on Microstructure and Properties of Ti-Ni Shape Memory Alloy[J].Rare Metal Materials and Engineering,2023,52(4):1455~1463.]
[doi] |
| 激光扫描速度对Ti-Ni形状记忆合金组织和性能影响 |
| 投稿时间：2022-04-08 修订日期：2022-08-29 |
| 中文关键词: Ti-Ni形状记忆合金 增材制造 工艺参数 显微组织 力学性能 |
| 基金项目:中国科学院创新交叉团队项目 |
| 中文摘要: |
| 采用激光选区熔化(Selective Laser Melting, SLM) 成形技术制备Ti-Ni形状记忆合金，利用OM、SEM、XRD和室温压缩等研究SLM增材制造参数改变对成形合金内部缺陷、熔池形貌、相变行为及力学性能等影响规律。结果表明，在SLM其它打印参数保持不变的情况下，随激光扫描速度增加成形合金内部缺陷形貌由近规则球形转变为不规则形状；逐行扫描熔池形貌宽度降低且连续性下降；随激光扫描速度增加富Ni基Ti-Ni形状记忆合金相组成含量发生改变，B2奥氏体相含量增加B19’马氏体相含量减少；成形富Ni基Ti-Ni形状记忆合金相变温度随激光扫描速度增加先降低后升高，但升降温相变过程中均为单一相变峰；当扫描速度为900 mm/s时成形富Ni基Ti-Ni形状记忆合金相对密度达到98.5%，内部缺陷含量较少且处于缺陷类型转变范围内，同时试样的最大抗压强度为3120 MPa，对应压缩应变为41%，具有较好的综合性能，为最佳打印参数。 |
| Effects of Laser Additive Manufacturing Parameters on Microstructure and Properties of Ti-Ni Shape Memory Alloy |
| 英文关键词:Ti-Ni shape memory alloy Additive manufacturing Process parameters Microstructure Mechanical Properties |
| 英文摘要: |
| Selective Laser Melting (SLM) was used to fabricate Ti-Ni shape memory alloys. The effect of scanning speeds on alloys was studied using OM, SEM, XRD, and room-temperature compression. The results show that with increased laser scanning speed, the internal defect morphology changes from a nearly regular spherical shape to an irregular one. For instance, the width and continuity of the molten pool morphology decrease with the increase in laser scanning speed. Besides, the increasing laser scanning speed initiates B19" martensite content decreases, B2 austenite content increases, and the phase transition peak is reached during the transformation process. At 900 mm/s of the scanning speed, the relative density of the alloy reaches 98.5%, yielding the minimum internal defects. Simultaneously, the sample has a maximum compressive strength of 3120 MPa and a compressive strain of 41%, which is the best printing parameter to produce exceptional properties. |
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