Optimized properties on base metal and thin-walled tube of generation II ATF FeCrAl

Database on Performance of Neutron Irradiated FeCrAl Alloys

“…Generation I alloys are ORNL developed model FeCrAl alloys with Y additions used to screen primary composition effects (Cr and Al) on radiation tolerance, as well as other key performance aspects such as welding [21], oxidation [4,9,22], burst behavior [23], and corrosion [24]. Generation I alloys are otherwise referenced as B-series alloys or model alloys in previous reports [3,[5][6][7][8][9][10][11][12][13][14][15][16]. Generation II alloys are ORNL developed FeCrAl alloys with Y additions that also include additional minor alloying elements such as Mo, Nb, Si, and/or C. Minor alloy additions and further refinement in thermomechanical processing for Generation II alloys means generally a higher strength alloy at elevated temperatures compared to Generation I alloys with identical or similar Cr and/or Al contents [3].…”

“…Fits to the experimental data assume "# clusters to be monodisperse spheres interacting with an exclusion volume and take the function form [6]:…”

“…Phase I was based around exploratory studies of the Fe-Cr-Al design space and focused primarily on assessment of how various aspects of alloy performance were affected by major alloying element composition. The alloys utilized for these investigations were simple FeCrAl-Y model alloys and are typically regarded as Generation I FeCrAl alloys within reporting [3,[5][6][7][8][9][10][11][12][13][14][15][16]. These Phase I alloys have demonstrated that higher Cr and Al contents are generally more desirable for maximizing corrosion and/or oxidation resistance but too much of either can limit alloy applications; excessive Cr additions increase the formation of embrittling Cr-rich αʹ precipitates [17][18][19], while high Al content results in failure during the seamless tube extrusion process required for LWR cladding fabrication [20].…”

“…Computational thermodynamics models were utilized to guide minor alloying additions in order to enhance material strength while maintaining adequate high temperature oxidation resistance and good fabricability for thin-walled tube extrusion by commercial manufacturers. Summaries of the Generation II ATF FeCrAl alloys down-selection and design process can be found in previously published reports [3,[5][6][7][8][9][10][11][12][13][14][15][16]. These engineering alloys are currently undergoing irradiation in the High Flux Isotope Reactor (HFIR) at ORNL, with a subset of low-fluence specimens recently becoming available for analysis.…”

Development and quality assessments of commercial heat production of ATF FeCrAl tubes

“…Stress-strain curves of selected Phase I and Phase II alloys tested at RT, showing the effects of (a) the Mo and Nb additions and (b) the Al addition on the tensile properties [10] 16 Figure 2. Commercial thin-wall tube fabrication processes; (a) tube drawing with a mandrel [13], and (b) pilgering [14]. Note that HPTR and VMR stand for "high-precision tube roller" and "vertical mass ring die", respectively .. Table 4.…”