Weld metal microstructure analysis of 9–12% Cr steels |
| |
| Affiliation: | 1. Laser Processing Research Centre, School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Sackville Street, Manchester, M13 9 PL, UK;2. Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China;1. LaBPS-ENIM, 1, rue d''Ars Laquenexy, 57078 Metz Cedex 03, France;2. LEM3, Université de Lorraine, Ile du Saulcy, 57000 Metz, France;1. State Key Lab. of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354 PR China;2. School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, PR China;1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur-721302, West Bengal, India;2. Indira Gandhi Center for Atomic Research, Kalpakkam-603102, India |
| |
| Abstract: | High-strength 9–12% Cr steels have been developed to meet the demand by power generation companies to increase efficiency by operating at higher temperatures. The 9–12% Cr steels used for high-temperature components in power plants are generally required to possess good mechanical properties, corrosion resistance, creep strength and fabricability. Although such steels normally have a fully martensitic microstructure, they are also susceptible to the formation of delta ferrite, mainly during the welding process. Delta ferrite has several detrimental effects on properties such as creep, ductility and toughness. Thus, it is important to avoid its formation.This paper analyses the microstructure in the weld metal of high-strength 9–12% Cr steels for several samples with variations of key alloying elements. The results indicate that the most effective way to avoid delta ferrite in the weld metal to obtain a fully martensitic microstructure is to reduce the ferrite former elements as low as possible. The partial substitution of Mo for W favours austenite stability and would be expected to improve the mechanical properties at high temperature. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
