Bibliographic Details
| Title: |
Precipitation behavior of the G-phase strengthened 7Ni maraging steels |
| Authors: |
Mujin Yang, Daobin Zhang, Zhifu Yao, Zhen Ma, Junhua Luan, Cuiping Wang, Bernd Kuhn, Zengbao Jiao, Yilu Zhao, Tao Yang, Xingjun Liu, Shuai Wang |
| Source: |
Journal of Materials Research and Technology, Vol 26, Iss , Pp 9261-9275 (2023) |
| Publisher Information: |
Elsevier, 2023. |
| Publication Year: |
2023 |
| Collection: |
LCC:Mining engineering. Metallurgy |
| Subject Terms: |
Alloy design, Ni16X6Si7 G-phase, Precipitation hardening, Maraging steel, Microstructural control, Mining engineering. Metallurgy, TN1-997 |
| More Details: |
In this study, G-phase strengthened 7Ni maraging alloys were studied using a combination of thermodynamic prediction based on the TCFE-7 database and advanced experimental techniques, including micro-hardness testing, electron backscatter diffraction (EBSD), in-situ X-ray diffraction (XRD), transmission electron microscopy (TEM), and atom probe tomography (APT). The martensite reversion and phase stability of overcooled austenite were precisely determined for a series of Fe–7Ni–2Si-based alloys, validating the effectiveness of thermodynamic predictions in martensite transformation.Based on these theoretical prediction, aging hardness measurements and microstructural observations further revealed that Ni16X6Si7-G (X = Ti, Nb, Ta) precipitates are effective strengthening phases in 7Ni maraging steel, with the exception of Ni16X6Si7 (X = Mn, Zr) due to their significantly different thermal stabilities. Experimental results showed that the Ni16X6Si7-G (X = Ti, Nb, Ta) precipitates remained stable and densely distributed within the martensitic matrix after aging at 500 °C, resulting in high aging hardness values ranging from 350 to 550 HV. Among the studied alloys, the 1Ti alloy strengthened by the Ni16Ti6Si7-G phase exhibited the finest particle radius (estimated at 1.4 nm) and the highest number density (estimated at 1.9 × 1024/m3). Additionally, it is worth noting that the Ni16Zr6Si7-G phase was believed to form through eutectic reaction with α-Fe during solidification and the Ni16Mn6Si7-G phase was only stable at temperatures below 460 °C and was not detected experimentally.These findings enhance our comprehension of G-phase precipitation and strengthening in 7Ni maraging steel and underscore the potential for utilizing thermodynamic calculations and advanced experimental techniques to guide the design and optimization of high-strength alloys. |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
2238-7854 |
| Relation: |
http://www.sciencedirect.com/science/article/pii/S2238785423023554; https://doaj.org/toc/2238-7854 |
| DOI: |
10.1016/j.jmrt.2023.09.230 |
| Access URL: |
https://doaj.org/article/1b67fd8dc9d54a7b9e34396455cc80af |
| Accession Number: |
edsdoj.1b67fd8dc9d54a7b9e34396455cc80af |
| Database: |
Directory of Open Access Journals |
