Alternative TitleEffects of Cr and Si on the microstructure and solidification path of austenitic stainless steel
易昊钰1; 陈思含2; 王旻2; 梁田2; 马颖澈2
Source Publication工程科学学报
Other AbstractThe lead-cooled fast reactor(LFR),which features advanced technical maturity and enhanced safety,is an important part of the fourth-generation nuclear power system of China.The superior safety of the LFR results from the choice of a relatively inert coolant,the lead or lead-bismuth eutectic(LBE),which can be rather corrosive to common metallic structural materials.Furthermore,there is basically no cladding material available for the LFR.Austenitic stainless steels feature a combination of excellent corrosion resistance,proper strength,and good workability,and materials such as 316 Ti and 15-15 Ti,which have been used in the sodium-cooled fast reactor(SFR),are viewed as promising candidate materials for LFR cladding applications.Elements of Cr and Si have been found capable of improving the corrosion resistance of 316 Ti and 15-15 Ti to LBE.However,as ferrite-forming elements,the influences of Cr and Si on the microstructural stability of 316 Ti and 15-15 Ti are still unclear.In this work,316 Ti-based materials with various Cr and Si contents were studied through thermodynamic simulation and microstructural characterization.Specifically,the equilibrium phase constitutions of the austenitic stainless steels were investigated by thermodynamic simulation using Thermo-Calc.The solidification microstructures and precipitates of Cr-and Si-bearing austenitic stainless steels were studied by optical microscopy(OM),scanning electronic microscopy(SEM),electronic differential system(EDS),and X-ray diffraction(XRD).The results show that Cr and Si can decrease the solidus and liquidus temperatures of alloys and induce the precipitation ofδ-phase.For alloy 18 Cr-2.0 Si-15 Ni,the maximum contents of Cr and Si are determined to be no more than 18.8%and 2.55%,respectively,which hindersδ-phase precipitation.In the ingot of 20 Cr-2.0 Si,δ-phase is found to be located within dendrites in a skeleton morphology,with a volume fraction of 8.6%,whereas in the ingot of 18 Cr-2.5 Si,δ-phase precipitates between dendrites,with a volume fraction of 3.4%.Moreover,this work also evaluates two kinds of austenitic stainless steel solidification path criteria.
Keyword奥氏体不锈钢 热力学模拟 凝固组织 δ相 硅元素
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Document Type期刊论文
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易昊钰,陈思含,王旻,等. Cr和Si元素对奥氏体不锈钢组织构成及凝固路线的影响[J]. 工程科学学报,2020,000(002):179-185.
APA 易昊钰,陈思含,王旻,梁田,&马颖澈.(2020).Cr和Si元素对奥氏体不锈钢组织构成及凝固路线的影响.工程科学学报,000(002),179-185.
MLA 易昊钰,et al."Cr和Si元素对奥氏体不锈钢组织构成及凝固路线的影响".工程科学学报 000.002(2020):179-185.
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