中国激光, 2016, 43 (4): 0403005, 网络出版: 2016-04-05   

激光温喷丸强化Inconel718 镍基合金热腐蚀性能研究

Research on Hot-Corrosion of Inconel718 Nickel-Based Alloy Treated by Warm Laser Shock Peening
作者单位
江苏大学机械工程学院, 江苏 镇江 212013
摘要
利用SpitLight2000型纳秒激光器对Inconel718镍基合金进行激光温喷丸(WLSP)强化实验,将WLSP 强化试样置于700 ℃混合熔盐(75%Na2SO4+25%NaCl,百分数指质量分数)中进行热腐蚀实验,对腐蚀前后的WLSP 强化试样进行质量损失检测、X 射线衍射(XRD)分析以及腐蚀形貌观察,探索了WLSP 改善Inconel718 镍基合金耐热腐蚀性的机理。结果表明,腐蚀10 h 与25 h 后260 ℃-WLSP 试样的质量损失分别为未处理试样的18.9%与17.9%。WLSP热腐蚀10 h后试样表面的Cr2O3氧化膜未出现明显剥落,且没有CrS、NiO 产物生成,说明WLSP处理后的试样表面没有受到S的侵蚀,故能有效抑制材料热腐蚀行为的发生,分析认为WLSP试样表面微观组织的晶粒细化及γ″ 相析出物能有效减缓O、S的侵入,进而有效提高Inconel718镍基合金的耐热腐蚀性能。
Abstract
A SpitLight2000 nanosecond laser is used to conduct warm laser shock peening (WLSP) experiment on Inconel718 nickel-based alloys. Thermal corrosion test is conducted on the WLSP-samples and untreated samples in mixed molten salt (75%Na2SO4+25% NaCl, percentage mentioned above denotes mass fraction) at 700 ℃. Then the mechanism of WLSP to improve the corrosion resistance of Inconel718 nickel-based alloys is researched by quality detection, X-ray diffraction (XRD) diffraction analysis and corrosion morphology observation. The results show that quality losses in 260 ℃- WLSP- samples after 10 h and 25 h are 18.9% and 17.9% of that in untreated samples. In addition, after thermal corrosion for 10 h, Cr2O3 oxidation doesn′t peel obviously on the corrosion surface of WLSP-samples and thus CrS or NiO is not formed. It is indicated that WLSP-samples can prevent implantation of S and thus effectively suppresses thermal corrosion of materials. The reason is that WLSP can lead to grain refinement and γ″ -phase precipitates, which effectively prevents invasion of O and S, and thus improves thermal corrosion resistance of Inconel718 nickel-based alloys.

郑刚, 孟宪凯, 陈松玲, 穆丹, 杨祥伟, 盛杰, 周建忠. 激光温喷丸强化Inconel718 镍基合金热腐蚀性能研究[J]. 中国激光, 2016, 43(4): 0403005. Zheng Gang, Meng Xiankai, Chen Songling, Mu Dan, Yang Xiangwei, Sheng Jie, Zhou Jianzhong. Research on Hot-Corrosion of Inconel718 Nickel-Based Alloy Treated by Warm Laser Shock Peening[J]. Chinese Journal of Lasers, 2016, 43(4): 0403005.

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