High-Temperature Oxidation Resistance Properties of High-Boron Austenitic Steels
Author of the article:CHEN Xiang;LI Yanxiang;LIU Yuan;ZHANG Huawei
Author's Workplace：School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory for Advanced Materials Processing Technology,Ministry of Education of China,Beijing 100084,China
Key Words：austenite boride high-boron austenite steel(HBAS) high-temperature oxidation resistance property
Abstract：The high-temperature oxidation resistance properties of high-boron austenite steels(HBASs)at 850℃were studied.The microstructure of the material was studied by SEM.The results show that the antioxidant rating of boron-free austenitic heat resisting steel at 850℃for 9 h and 20 h is“weak antioxidant”of grade 4 in GB/T 13303-1991,and the materials oxidation resistance at high temperature is better than that of grade 5“non-antioxidant”of ESR-H13.After the addition of boron,boron is conducive to the formation of dense oxide film CrBO3 during the oxidation process,which effectively prevents the further oxidation and improves the antioxidant properties of the materials.The austenitic heat resistant steel containing boron 0.3%and carbon 0.5%reach the antioxidant rating of grade 2“antioxidant”at 850℃for 9 h and 20 h.When the carbon content of high boron austenitic heat resistant steel increases from 0.2%to 0.4%,the material has good antioxidant properties,and the oxidation rates of 9 h and 20 h under 850℃reach the level 2“antioxidant”standard.The higher carbon content improves the stability of austenite matrix and facilitates the formation of CrBO3.The high boron austenitic steel has better oxidation resistance than ESR-H13 steel.
