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利用Spit Light2000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%Na Cl,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Cr S、Ni O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。
The laser-induced shot peening (WLSP) of Inconel 718 Ni-based alloy was carried out using a Spit Light2000 nanosecond laser. The WLSP-strengthened sample was placed in a mixed molten salt at 700 ℃ (75% Na2SO4 + 25% NaCl, , The hot loss test, the X-ray diffraction (XRD) analysis and the observation of the corrosion morphology of WLSP strengthened samples before and after corrosion were carried out to explore the mechanism of WLSP improving the heat corrosion resistance of Inconel 718 nickel base alloy. The results show that the mass loss of 260 ℃ -WLSP after 10 h and 25 h corrosion is 18.9% and 17.9% of the untreated sample, respectively. After the WLSP hot etching for 10 h, the Cr2O3 oxide film on the sample surface did not peel off obviously, and no Cr S, Ni O product was generated, indicating that the surface of the sample after WLSP treatment was not attacked by S, The analysis shows that the grain refinement and γ "phase precipitates on the surface of WLSP sample can effectively reduce the intrusion of O and S, and then effectively improve the heat corrosion resistance of Inconel718 nickel base alloy.