Effect of Al on the Microstructure and Mechanical Properties of HK40 Heat-Resistant Steel at High Temperature

Abstract:

The high-temperature mechanical properties and microstructure of HK40 heat-resistant steel with different content of Al were investigated. The results from scanning electron microscope and transmission electron microscope showed that a large amount of spheroidal and dispersed γ′ phase were observed HK40 steel with 4.72wt.% and 7.10wt.% Al. The diameter of γ′ phase decreases from about 1.5μm to 50nm after solution treatment of 1200°C for 5h. The results of short term tensile test showed that tensile strength at 900°C decreased and the elongation was improved with increasing Al content. The oxides in the alloy with 4.72wt.% and 7.10wt.% Al were more uniform and finer than that in the alloy with and without 1.68wt.% Al.

• Periodical: Materials Science Forum (Volume 849)
• Pages: 542-548
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.849.542
• Online since: March 2016
• Authors: Yan Zhang, Yu Fei Mei, Ning Zhou, Zheng Qin Liu, Yu Fu Sun
• Keywords: Al, High Temperature, HK40 Heat-Resistant Steel, Mechanical Properties, Microstructure

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