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| Effect of aluminum on microstructure and properties of high alumina ferritic heat resistant steel |
| WEI Tong-yu, ZOU De-ning, ZHANG Ying-bo, CHEN Wan-wan |
| School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China |
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Abstract High-aluminum ferritic heat-resistant stainless steel as a new type of low-cost structural material is mainly used in the supercritical and ultra-supercritical thermal power generation.In order to clarify the mechanism of the effect of Al on the steel property,Al mass percent based on X10CrAlSi18 steel and obtained two different compositions of ferritic heat-resistant stainless steel was optimized. The microstructure was characterized by means of metallographic microscope (OM) and scanning electron microscope (SEM),and its mechanical properties were measured by hardness test and tensile test. The experimental results show that the increase of Al mass percent facilitates the recrystallization process and grain refinement.The Al element reduces the diffusion rate of carbon and inhibits the precipitation and aggregation of carbides. Besides that,with the increase of Al mass percent,the tensile strength,yield strength,and hardness of the material are improved,and the elongation is decreased.
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Received: 16 September 2019
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2020, Vol. 55 
