强流脉冲离子束辐照316L不锈钢蠕变性能的实验研究

Experimental Research on Creep Property of 316L Stainless Steel Irradiated by High-intensity Pulsed Ion Beams

利用强流脉冲离子束(HIPIB)对316L不锈钢进行了表面辐照处理。辐照参数为:离子种类包括70%C+和30%H+,离子能量E=300keV,束流密度J=100,200,300A/cm2,辐照次数N=10,脉冲宽度τ=75ns,真空室本底真空度为10-3Pa。采用扫描电子显微镜(SEM)观察辐照前后试样的表面形貌;用X射线衍射(XRD)分析辐照前后试样表面层结构和成分的变化。结果表明,HIPIB辐照使试样表面光滑化,且表面层产生择优取向。研究了HIPIB辐照对316L不锈钢700℃蠕变性能的影响,发现辐照后试样的蠕变行为与束流密度密切相关。当束流密度为100,200A/cm2时,HIPIB辐照延长了原始试样的蠕变寿命;相反,300A/cm2的HIPIB辐照则使其缩短。

The surface of 316L stainless steel was treated by high-intensity pulsed ion beams(HIPIB).The HIPIB parameters were ion energy(70%C^+,30%H^+) E=300keV,current density J=100,200 and 300A/cm^2,shot number N=10 pulses,pulse duration τ=75ns,and the pressure in the vacuum chamber was 10^(-3)Pa.The surface morphology of unirradiated and irradiated samples were observed with scanning electron microscopy(SEM);X-ray diffraction(XRD) method was used to determine the phase and structural changes that occurred in the near surface region of the samples after HIPIB irradiation.It is shown that the HIPIB irradiation can smooth the surface of the samples,and the preferred orientation was present in the surface layer of these coupons.The influence of HIPIB irradiation on the creep property of 316L stainless steel at 700℃ was investigated.It is found that the creep property of the irradiated coupons depends greatly on the ion current density of HIPIB.HIPIB irradiation with ion current density of 100A/cm^2 and 200A/cm^2 prolonged the creep rupture life with respect to the unirradiated coupon.In contrast,HIPIB irradiation with ion current density of 300A/cm^2 proved to be detrimental,causing a shorten creep life.