Microstructure and Properties of Heat Treatment GH4169 Alloy by Laser Deposition Repair

Hongyou, 卞宏友 Bian; Xiangpeng, 赵翔鹏 Zhao; Guang, 杨光 Yang; Lanyun, 钦兰云 Qin; Wei, 王伟 Wang; Shijie, 王世杰 Wang; Yuhang, 任宇航 Ren

doi:10.3788/cjl201542.1206001

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As-repaired specimen 736.6 12.5 As-received substrate 934.9 56.7 Casting standard (Q/5B 453-1995) [40] 825 5 Wrought standard (Q/3B 548-1996) [41] 1340 12 Figure 10 photographically shows the repaired Inconel 718 alloy specimens after tensile testing at room temperature, which were pre-corrosion-tested in the molten salt at 650 • C for different exposure times. It can be seen that the fracture occurred in the repaired zone rather than in the interface zone for all specimens, which indicates that the repaired zone was well bonded with the substrate and the repaired zone was the weakest area.…”

Section: Sample Tensile Strength (Mpa) Elongation (%)mentioning

confidence: 99%

Hot Corrosion and Mechanical Performance of Repaired Inconel 718 Components via Laser Additive Manufacturing

Zhang

Zhuang

et al. 2020

Materials

View full text Add to dashboard Cite

Hot corrosion is one of the crucial failure modes of Ni-based superalloy components operating at high temperatures, which inevitably affects the subsequent mechanical properties of the alloys. In this research, damaged Inconel 718 alloy components with a pre-made trapezoid groove are repaired using laser additive manufacturing technique, and the change mechanisms of the microstructure and tensile properties of the repaired Inconel 718 alloy due to the hot corrosion in the salt mixture of 87.5 wt.% Na2SO4 + 5 wt.% NaCl + 7.5 wt.% NaNO3 at 650 °C for different durations are investigated. The results show that oxidation and Cr-depletion occur on the repaired components due to the hot corrosion, and the corrosion products are mainly composed of Cr2O3, Fe3O4, and Ni3S2. The tensile strength and elongation of the as-repaired specimens are 736.6 MPa and 12.5%, respectively. After being hot corroded for 50 h, the tensile strength increases to 1022.9 MPa and elongation decreases to 1.7%. However, after being hot corroded for 150 h, both tensile strength and elongation of the repaired specimens drop to 955.8 MPa and 1.2%, respectively. The mechanical performance alteration is highly related to thermal effects instead of the molten salt attack.

show abstract

Section: Sample Tensile Strength (Mpa) Elongation (%)mentioning

confidence: 99%