Effect of Normalizing Temperature on Microstructure and Mechanical Properties of 11Cr–3Co–2.3W Steel. Issue 5 (6th March 2019)

• Record Type: Journal Article
• Authors: Cui, Chenshuo; Gao, Xiuhua; Zhu, Chenglin; Hu, Deyong; Gao, Cairu; Liu, Zhenguang; Misra, Raja Devesh Kumar; Su, Guanqiao
• Is Part Of: Steel research international. Volume 90:Issue 5(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-03-06
• Subjects: mechanical properties -- microstructure -- normalizing temperature -- strengthening mechanism; Steel -- Periodicals; Steel -- Metallurgy -- Periodicals; 669.142
• DOI: 10.1002/srin.201800555
• Languages: English
• ISSNs: 1611-3683

Abstract

Abstract : Mechanical properties of 11Cr–3Co–2.3W steel are affected by various parameters, and normalizing temperature is an important parameter. OM, FESEM, EBSD, and TEM are carried out to study the microstructure evolution of 11Cr–3Co–2.3W steel normalized at different temperature ranging from 900 °C to 1150 °C and tempered at 780 °C. The tensile and impact properties are evaluated from the tempered specimens. The results show that an obvious grain coarsening occurs and the tempered strength of 11Cr–3Co–2.3W steel increases with increasing normalizing temperature. The specific strengthening mechanisms are discussed. The fracture morphology shows mainly dimples and cleavage facets, implying mixed‐mode of fracture mechanism when the normalizing temperature is up to 1050 °C. Normalizing at 1150 °C, the mixed‐mode of fracture mechanism is transformed to brittle fracture. Abstract : The different normalizing temperature are applied to investigate the microstructure evolution and mechanical properties in the 11Cr–3Co–2.3W martensitic heat resistant steel. The microstructural observation suggests that the austenite grains coarsen obviously with increase of normalizing temperature, which leads to the decrease in the availability of grain boundaries for the precipitation. Throught JMatPro software calculations and theoretical equation, the strengthening mechanism is discussed.