热等静压对增材制造FeCrAl合金的He离子辐照性能的影响

doi:10.11900/0412.1961.2024.00373

金属学报 DOI: 10.11900/0412.1961.2024.00373

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热等静压对增材制造FeCrAl合金的He离子辐照性能的影响

杨金学¹,王曦¹,苏钲雄¹,张平¹,白玉曦²,滕常青²,吴璐²,伍晓勇²,高瑞¹,卢晨阳¹

1 西安交通大学能源与动力工程学院西安 710049

2 中国核动力研究设计院第一研究所成都 610041

Effects of Hot Isostatic Pressing on the Helium Ion Irradiation Performance of Additively Manufactured FeCrAl Alloys

YANG Jinxue ¹, WANG Xi ¹, SU Zhengxiong ¹, ZHANG Ping ¹, BAI Yuxi ¹, TENG Changqin ², WU Lu ², WU Xiaoyong ², GAO Rui ¹, LU Chenyang ¹

1 School of Energy and Power Engineering, Xi’an Jiao Tong University, Xi’an 710049, China

2 The First Sub-Institute, Nuclear Power Institute of China, Chengdu 610041, China

引用本文:

杨金学王曦苏钲雄张平白玉曦滕常青吴璐伍晓勇高瑞卢晨阳. 热等静压对增材制造FeCrAl合金的He离子辐照性能的影响[J]. 金属学报, DOI: 10.11900/0412.1961.2024.00373.

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摘要:

FeCrAl合金被认为是极有潜力的新型耐事故燃料包壳候选材料之一，深入研究增材制造FeCrAl合金的特殊微观结构及热处理工艺对辐照缺陷的形成及演化的影响机制，有助于“核级”FeCrAl合金的开发。本工作在350和450 ℃下对增材制造原始打印态和热等静压(HIP)处理态的合金进行400 keV的氦离子辐照，观察并对比分析了2种合金He泡、位错环等辐照缺陷的形成与演化及其对力学性能的影响。结果表明，相较于原始打印态FeCrAl合金，HIP处理后的FeCrAl合金位错环和He泡的尺寸有所增加，而He泡的密度有所下降。纳米压痕结果表明，同样辐照条件下，HIP处理的FeCrAl合金的辐照硬化率(52%)大于原始打印态合金(41%)；经弥散障碍硬化(DBH)模型计算确认辐照后样品中He泡和位错环是造成辐照硬化的主要原因。原始打印态合金中高密度的位错线有效吸收了更多的He原子和间隙原子，既有效降低了位错环的密度和尺寸，又抑制了He泡的长大。HIP通常用来提高增材制造合金的力学性能，但该过程会导致增材制造合金中原有的点缺陷陷阱消失，这在一定程度上降低了材料的抗辐照性能。

关键词 ： FeCrAl合金, 增材制造, 热等静压, He离子辐照, 辐照硬化

Abstract：FeCrAl alloys are regarded as highly promising candidates for accident-tolerant fuel cladding. This study investigates the influence of hot isostatic pressing (HIP) on the microstructural evolution and mechanical properties of additively manufactured FeCrAl alloys subjected to He ion irradiation. Irradiation experiments were conducted on both the as-printed and HIP-treated conditions of additively manufactured FeCrAl alloys at 350 °C and 450 °C, using 400 keV He ions with a fluence of 1.02 × 101? ions/cm2. The formation and evolution of irradiation-induced defects, including He bubbles and dislocation loops, as well as the corresponding changes in mechanical properties, were systematically characterized and analyzed using transmission electron microscopy (TEM) and nanoindentation techniques. The results indicate that, following HIP treatment, the size of dislocation loops and He bubbles in FeCrAl alloys increased, while the density of He bubbles decreased, compared to the pristine as-printed state. Nanoindentation measurements further revealed that the irradiation hardening rate of the HIP-treated FeCrAl alloy (52%) is significantly higher than that of the as-printed alloy (41%) under identical irradiation conditions. The DBH model calculations confirmed that He bubbles and dislocation loops in the irradiated samples are the primary contributors to irradiation-induced hardening. The analysis suggests that the high density of dislocation lines in the as-printed state facilitates the effective absorption of He atoms and interstitials, which in turn reduces the density and size of dislocation loops and suppresses the growth of He bubbles. The microstructural modifications induced by HIP have been found to reduce the irradiation resistance of the additively manufactured FeCrAl alloys to some extent. HIP is commonly used to enhance the mechanical properties of additively manufactured alloys. However, this process eliminates pre-existing point defect sinks in the alloy, which, to some extent, reduces the material's irradiation resistance.

Key words： FeCrAl alloys additive manufacturing hot isostatic pressing He ions irradiation irradiation hardening

收稿日期: 2024-11-04

ZTFLH:

TL426

基金资助:国家重点研发计划项目;国家自然科学基金项目;国家资助博士后研究人员计划

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	吴璐
	伍晓勇
	高瑞
	卢晨阳
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链接本文:

https://www.ams.org.cn/CN/Y0/V/I/0

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