基于对影响非线超声性检测因素的探讨，考察了应用非线性检测无损评价H R3C烟侧腐蚀的可行性。结果表明：脉冲激励串个数 n≤2df／c ，加汉宁窗有助于降低系统干扰，此外，样品表面粗糙度对非线性系数β产生显著的影响。随腐蚀时间的延长，非线性系数呈现阶段性的递增趋势。腐蚀初期（腐蚀时间在50h以内），非线性系数增幅不足20％；然而，腐蚀至150h ，非线性系数显著增加；相对于未腐蚀样品，腐蚀200h时的非线性系数增幅达260％。非线性系数的单调变化与腐蚀损伤的加剧相一致，因此，应用超声非线性无损评价 H R3C的烟侧腐蚀是可行的。
Based on the discussion of the factors influencing the nonlinear ultrasonic testing ,the feasi‐bility of nondestructive evaluation of HR3C fireside corrosion was investigated using nonlinear ultra‐sonic testing .The results show that the number of pulse string is no more than 2df/c and the installa‐tion of Hanning window is helpful to reduce the disturbance of the system ,in addition ,the rough sur‐face of the sample has a significant impact on the nonlinear parameter β.The nonlinear coefficient demonstrates a phased growth trend as corrosion time prolongs .At the initial stage of corrosion(with‐in 50h) ,there are small increments within 20% in the nonlinear coefficient ,however ,the nonlinear co‐efficient βis increased obviously with the duration time to 150h .Compared with un‐corroded sample , the amplification in the sample corroded for 200h reaches to 260% .The monotonous varieties in non‐linear coefficient are consistent with the aggravation of corrosion damage ,hence ,it is feasible to nonde‐structively evaluate HR3C fireside corrosion by means of ultrasonic nonlinear testing .
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