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- Title
Effect of Solidification Segregation on Microstructure and Mechanical Properties of a Ni-Cr-Mo-V Steel Weld Metal.
- Authors
Han, Chaoyu; Liu, Qu; Cai, Zhipeng; Huo, Xin; Fan, Manjie; Li, Kejian; Pan, Jiluan
- Abstract
The effects of solute elements segregation during solidification on microstructure evolution and mechanical properties of a Ni-Cr-Mo-V rotor weld metal were studied. The alloy elements, such as Mn and Ni, segregated at inter-dendritic (ID) region, resulting in microstructural inhomogeneity between ID and dendritic core (DC) region. The microstructure of ID and DC region was characterized in detail by transmission electron microscopy (TEM) and transmission electron backscatter diffraction (T-EBSD). The results showed that the microstructure of ID region was composed of untempered martensite and retained austenite, while the bainite and ferrite were found at DC region. Two morphologies of retained austenite, film-like and blocky, were formed at different nucleation sites within ID region. The film-like retained austenite distributed at low-angle martensite lath boundaries held a near Nishiyama–Wasserman (N–W) orientation relationship with its surrounding untempered martensite lath, while the blocky retained austenite distributed at high-angle boundaries held no special orientation relationship with surrounding matrix. The segregation behavior of alloy elements was analyzed by Scheil solidification simulation. The formation mechanism of untempered martensite and retained austenite was proposed and the effects of ID segregation on impact toughness and hardness were discussed.
- Subjects
STEEL welding; SOLIDIFICATION; BAINITIC steel; METALS; MICROSTRUCTURE; TRANSMISSION electron microscopy; FILLER metal
- Publication
Metallurgical & Materials Transactions. Part A, 2022, Vol 53, Issue 4, p1394
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-022-06600-w