铸造技术2026，Vol.47Issue(8)：888-893,6.DOI:10.16410/j.issn1000-8365.2026.6108
升温速率对锆合金管材氢化物析出的影响
Effect of Heating Rate on Hydride Precipitation in Zirconium Alloys
摘要
Abstract
Zirconium alloys are widely used as fuel cladding in light water reactors because of their optimal combination of mechanical strength,corrosion resistance,and low neutron absorption cross-section.During operation,cladding inevitably absorbs hydrogen from the high-temperature coolant.Conventionally,hydride precipitates exhibit a circumferential orientation under stress-free conditions,and reorientation into a radial morphology is traditionally attributed to sustained tensile hoop stress.Here,it is demonstrated that pronounced hydride reorientation can occur under stress-free conditions,triggered solely by rapid thermal transients.The experimental results reveal that at a heating rate of 20℃/min,a localized,radially oriented hydride aggregation zone-resembling a"sunspot"—emerges on the outer cladding surface.Mechanistic analysis indicates that rapid heating establishes a steep through-thickness temperature gradient,which,under deformation compatibility,forces the expanding outer wall to be constrained by the inner wall and consequently drives a dynamic circumferential tensile stress gradient.This transient gradient drives solute hydrogen toward regions of higher tensile stress via uphill diffusion and triggers rapid precipitation in the supersaturated matrix,preferentially aligning hydrides perpendicular to the principal tensile axis.关键词
锆合金/氢化物/升温速率/再取向Key words
zirconium alloys/hydride/heating rate/reorientation分类
矿业与冶金引用本文复制引用
程绍杨,严孟元,惠泊宁,陈彪,李金山..升温速率对锆合金管材氢化物析出的影响[J].铸造技术,2026,47(8):888-893,6.基金项目
国家自然科学基金(U25B20112) （U25B20112）
