中文摘要：

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HR3C烟侧腐蚀的可行性。结果表明：脉冲激励串个数〃<2^/八，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HR3C的烟侧腐蚀是可行的。

英文摘要：

Based on th e discussion o f th e fa c to rs in flu e n c in g th e n o n lin e a r u ltra s o n ic te s tin g,th e feasibility o f n o n d e s tru c tiv e e va lu a tio n o f H R3C fire s id e c o rro s io n w as in v e s tig a te d u sing n o n lin e a r u ltra sonicte s tin g.T h e re s u lts show th a t th e n u m b e r o f pulse s trin g is no m ore th a n2d f/c and th e in s ta lla tion o f H a n n in g w in d o w is h e lp fu l to reduce th e d istu rb a n ce o f th e s y s te m,in a d d itio n,th e ro u g h s u rfaceo f the sam ple has a s ig n ific a n t im p a c t on th e n o n lin e a r p a ra m e te r j3.T h e n o n lin e a r c o e ffic ie n td em onstrates a phased g ro w th tre n d as c o rro s io n tim e p ro lo n g s.A t th e in itia l stage o f c o rro s io n(w ith-in50h),th e re are sm a ll in cre m e n ts w ith in20%in th e n o n lin e a r c o e ffic ie n t,h o w e v e r,th e n o n lin e a r coeffic ie n t j3is increased o b v io u s ly w ith th e d u ra tio n tim e to150h.C om pared w ith u n-co rro d e d sam ple,th e a m p lific a tio n in th e sam ple co rroded fo r200h reaches to260%.T h e m o n o to n o u s v a rie tie s in n o n line a r c o e ffic ie n t are c o n siste n t w ith th e a g g ra va tio n o f c o rro s io n d a m a g e,h e n c e,it is feasible to nondestru c tiv e ly evaluate H R3C fire s id e c o rro s io n b y means o f u ltra s o n ic n o n lin e a r te s tin g.