Effects of yttrium and zirconium additions on inclusions and mechanical properties of a reduced activation ferritic/martensitic steel  

作　　者：Dong-ping Zhan Guo-xing Qiu Chang-sheng Li Min Qi Zhou-hua Jiang Hui-shu Zhang 

机构地区：[1]School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China [2]State Key Laboratory of Rolling and Automation.Northeastern University,Shenyang 110819,Liaoning,China [3]School of Metallurgy Engineering,Liaoning Institute of Science and Technology,Benxi 117004.Liaoning,China

出　　处：《Journal of Iron and Steel Research International》2020年第2期197-207,共11页

基　　金：National Natural Science Foundation of China(Nos.51874081 and 51574063);Fundamental Research Funds for the Central Universities(N150204012).

摘　　要：The effects of two alloying elements,i.e.,yttrium(Y)and zirconium(Zr),on the inclusion,microstructure,tensile property and impact toughness of reduced activation ferritic/martensitic(RAFM)steel are analyzed.The size and number of particles were determined by optical microscopy,and the particle types were examined by scanning electron microscopy.The size of?20% and?85% of the inclusions lied in the range of 0.5-1.0μm and 0.5-3.0μm,respectively.In Y-and Y-Zr-containing specimens,the density of the fine inclusions,with a size less than 0.5μm,was found to be 1.06×10^17 and 9.82×10^16 m^-3.respectively.All specimens were normalized at 1323 K for 30 min and tempered at 923 and 1023 K for 90 min,resulting in the formation of tempered martensite with M23C6 carbides and MX precipitates.Zr-containing RAFM steel tempered at 923 K formed M23C6 carbides and nano-sized carbides with Zr,conferring superior strength balance and impact toughness.The yield strength of alloy reached 695 MPa,and a low ductile-brittle transition temperature of 238 K was maintained.

关 键 词：9Cr oxide-dispersion-strengthened steel Inclusion MECHANICAL property DBTT YTTRIUM ZIRCONIUM 

分 类 号：TG142.1[一般工业技术—材料科学与工程]