Effect of tempering on microstructure and tensile properties of niobium modified martensitic 9Cr heat resistant steel
作者： A. Mandal , T.K. Bandyopadhay
DOI: 10.1016/J.MSEA.2014.10.043
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摘要: Abstract The effect of tempering on the microstructure niobium modified 8.8 wt% chromium steel has been evaluated. Steel prepared using conventional melting and casting route. Homogenization forging is done at 1100 °C. Dilatometric study shows that Ac 1 , 3 M s temperatures are 800, 855, 131 °C, respectively. Initial cast forged microstructures consist martensite/ferrite. samples subsequently tempered 500–800 °C for various intervals time (1–5 h). sample analyzed optical microscopy, scanning electron X-ray diffraction. High Resolution Transmission Electron Microscopy (HRTEM) used to identify precipitate. Nanometer-sized precipitates (50–200 nm) observed after 700 °C 1 h. Niobium rich MC type carbide 23 C 6 700 °C. Tensile strength decreases with increasing temperature. Maximum tensile 920 MPa maximum elongation ~11% 750 °C.
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