Microstructure and high temperature creep properties of Inconel 625 alloy by selective laser melting

被引：0
|
作者：
Zhang Y. [1 ]
Jiang Y. [1 ]
Hu X. [1 ]
机构：
[1] Nanchang Hangkong University, Nanchang
来源：
Hu, Xiaoan (hu_xiao_an@163.com) | 1600年 / Harbin Research Institute of Welding卷 / 41期
关键词：
High-temperature creep; Inconel 625 nickel based alloy; Laser welding; Selective laser melting;
D O I：
10.12073/j.hjxb.20191211001
中图分类号：
学科分类号：
摘要：
Microstructure and high temperature creep properties of laser welded joints of Inconel 625 alloy fabricated by selective laser melting (SLM) method were investigated using optical microscope, scanning electron microscopy, X-ray diffraction, and energy dispersive spectrometer. The results show that the quality of laser welded joints of Inconel 625 alloy by SLM is superior, and no obvious manufacturing defects are found. The microstructure of the laser welded Inconel 625 alloy by SLM specimen is mainly composed of the austenitic in the base metal and columnar dendrites in the fusion zone. High temperature creep test results show that the creep time of the alloy drops sharply with the increase of the applied stress level. The higher stress level (200 MPa) has a great influence on the creep property of the alloy at the same temperature, which will lead to the creep deformation directly entering the third stage of creep-acceleration stage, and cause the sample to fracture earlier. The mechanism of creep failure was discussed by analyses of the fracture surface. It is found that the fracture of all specimens occurred in the base metal or near the heat-affected zone. A large number of secondary cracks were observed in the base metal, while no obvious cracks were found in the fusion zone. Also, the fracture morphology is characterized by a rock candy pattern, indicating the intergranular fracture mode. The deformation displacement induced by the grain boundary slipping at elevated temperature is the principal mechanism of the cavity nucleation. © 2020, Editorial Board of Transactions of the China Welding Institution, Magazine Agency Welding. All right reserved.
引用
收藏
页码：78 / 84
页数：6
相关论文
共 15 条
  • [1] Maj P, Koralnik M, Adamczyk-Cieslak B, Et al., Mechanical properties and microstructure of Inconel 625 cylinders used in aerospace industry subjected to flow forming with laser and standard heat treatment, International Journal of Material Forming, 12, 1, pp. 135-144, (2019)
  • [2] Li C, White R, Fang X Y, Et al., Microstructure evolution characteristics of Inconel 625 alloy from selective laser melting to heat treatment, Materials Science & Engineering A, 705, pp. 20-31, (2017)
  • [3] Jafari D, Wits W W, The utilization of selective laser melting technology on heat transfer devices for thermal energy conversion applications: a review, Renewable & Sustainable Energy Reviews, 91, pp. 420-442, (2018)
  • [4] Yin Yan, Liu Pengyu, Lu Chao, Et al., Microstructure and tensile properties of selective laser melting forming 316L stainless steel, Transactions of the China Welding Institution, 39, 8, pp. 77-81, (2018)
  • [5] Hu X A, Xue Z Y, Zhao G L, Et al., Laser welding of a selective laser melted Ni-base superalloy: microstructure and high temperature mechanical property, Materials Science & Engineering A, 745, pp. 335-345, (2018)
  • [6] Yang J J, Wang Y, Li F Z, Et al., Weldability, microstructure and mechanical properties of laser-welded selective laser melted 304 stainless steel joints, Journal of Materials Science & Technology, 35, 9, pp. 1817-1824, (2019)
  • [7] Wang Jinfeng, Yang Lijun, Sun Mingsheng, Et al., Effect of rapid cooling on mechanical properties of welded joint in laser welding of DP1000 dual phase steel, Transactions of the China Welding Institution, 40, 1, pp. 113-118, (2019)
  • [8] Ding Yutian, Meng Bin, Gao Yubi, Et al., Effect of solution treatment on the microstructure and mechanical properties of GH3625 superalloy sheet, Materials Review, 32, 2, pp. 243-248, (2018)
  • [9] Ramkumar K D, Kumar P S G, Radhakrishna V S, Et al., Studies on microstructure and mechanical properties of keyhole mode Nd: YAG laser welded Inconel 625 and duplex stainless steel, SAF 2205, Journal of Materials Research, 30, 21, pp. 3288-3298, (2015)
  • [10] Li X Q, Hao B X, Chen Y X, Et al., The microstructure mechanical performance for nonuniform welded joint of nickel-based alloy with nanoindentation, China Welding, 28, 2, pp. 29-34, (2019)
12