Room and Elevated Temperature Tensile Properties of IN718 Alloy Fabricated by Selective Laser Melting

QIU Changyue; HE Bei; CHEN Haoxiu; TANG Haibo

doi:10.16080/j.issn1671-833x.2020.22.063

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Room and Elevated Temperature Tensile Properties of IN718 Alloy Fabricated by Selective Laser Melting

更新时间：2025-10-30

- Room and Elevated Temperature Tensile Properties of IN718 Alloy Fabricated by Selective Laser Melting
- Aeronautical Manufacturing Technology Vol. 63, Issue 22, Pages: 63-69(2020)
- 作者机构：
  
  1. 北京航空航天大学大型金属构件增材制造国家工程实验室,北京,100191
  2. 大型整体金属构件激光直接制造教育部工程研究中心,北京,100191
  3. 大型关键金属构件激光直接制造北京市工程技术研究中心,北京,100191
  4. 北京航空航天大学前沿科学技术创新研究院,北京,100191
  5. 北京航空航天大学宁波创新研究院,宁波,315832
- 作者简介：
- 基金信息：
- DOI：10.16080/j.issn1671-833x.2020.22.063
  CLC：
- Published：2020
- 稿件说明：
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仇昌越，何蓓，陈昊秀，汤海波. 选区激光熔化IN718合金室温及高温拉伸性能研究[J]. 航空制造技术, 2020, 63(22): 63-69.

QIU Changyue, HE Bei, CHEN Haoxiu, TANG Haibo. Room and Elevated Temperature Tensile Properties of IN718 Alloy Fabricated by Selective Laser Melting. Aeronautical Manufacturing Technology, 2020, 63(22): 63-69.
仇昌越，何蓓，陈昊秀，汤海波. 选区激光熔化IN718合金室温及高温拉伸性能研究[J]. 航空制造技术, 2020, 63(22): 63-69. DOI： 10.16080/j.issn1671-833x.2020.22.063.

QIU Changyue, HE Bei, CHEN Haoxiu, TANG Haibo. Room and Elevated Temperature Tensile Properties of IN718 Alloy Fabricated by Selective Laser Melting. Aeronautical Manufacturing Technology, 2020, 63(22): 63-69. DOI： 10.16080/j.issn1671-833x.2020.22.063.

摘要

采用选区激光熔化技术制备了 IN718 合金，对其凝固组织形成机制和热处理固态相变行为进行了研究，分析了 IN718 合金经热处理后的室温和高温拉伸断裂机理。研究结果表明，选区激光熔化 IN718 合金沉积态显微组织为沿沉积增高方向定向生长的树枝晶，枝晶间分布着纳米级 Laves 相。经标准热处理后晶粒形态没有明显变化，大量 γ′ 和 γ′′ 相以及针状 δ 相弥散析出，Laves 相含量减少，合金硬度较沉积态高约 40%。经热处理后，合金垂直于沉积增高方向试样抗拉强度高于锻件，平行于沉积增高方向的试样塑性优于锻件，高温拉伸强度与锻件相当，室温及高温拉伸断裂机制均为微孔聚集型的穿晶韧性断裂。

Abstract

The IN718 alloys were fabricated by selective laser melting forming technique. The formation mechanism of solidi-fication structure and the behavior of phase transformation during heat treatment were investigated. The tensile fracture mechanism of IN718 alloy at room and high temperature after heat treatment was analyzed. The results show that the microstructure of sample is dendrite along building direction. Nanoscale Laves phase is distributed among the dendrites. The grain morphology has no obvious change after standard heat treatment. A large number of γ′

γ′′ and acicular δ phase dispersive precipitate. The content of Laves phase decreases and the hardness is about 40% higher than as-deposited samples. After heat treatment

the tensile strength of samples perpendicular to the building direction is higher than forgings. The plasticity of samples parallel to the building direction is better than forgings. The tensile strength is comparable to forgings at high temperature. The fracture mechanism of selective laser melted IN718 alloy after heat treatment is a through-granular ductile fracture mode of micropore aggregation.

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