Effect of tungsten on creep properties of martensitic 9Cr steel. Issue 1 (May 2020)

• Record Type: Journal Article
• Authors: Hu, F Y; Zhang, S J; Shen, J J
• Is Part Of: IOP conference series. Volume 838:Issue 1(2020)
• Publication Date: 2020-05
• Subjects: M23C6 -- the minimum creep rate -- tungsten -- the creep strength; Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/838/1/012003
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: The effects of tungsten on the creep behavior and microstructure of tempered martensite 9Cr steel with different W concentrations ranging from 0–2.5 wt% were studied. The matrix consisted of tempered lath martensite structure and M23 C6 located along the grain boundary or inside the grain. As the W concentration increased, the number of M23 C6 increased while the particle size decreased. Also, with the increasing W concentration, the minimum creep rate and elongation decreased while the time to rupture increased. The rise in W concentration led to the refinement of M23 C6, which enhanced the creep strength but reduced the creep plasticity.