疲劳及拉伸预形变对纯铜应力腐蚀敏感性的影响  

EFFECTS OF CYCLIC AND MONOTONIC PRESTRAINING ON THE STRESS CORROSION CRACKING SUSCEPTIBILITY OF COPPER

作　　者：史博[1] 宿彦京[1] 王燕斌[1] 乔利杰[1] 褚武扬[1] 

机构地区：[1]北京科技大学材料物理系,北京100083

出　　处：《金属学报》2001年第2期161-164,共4页Acta Metallurgica Sinica

基　　金：国家重点基础研究 G19990650;国家自然科学基金50071010;国家自然科学基金19891180

摘　　要：用慢应变速率拉伸法研究了疲劳预形变以及拉伸预形变对纯钢在ＮａＮＯ２溶液中应力腐蚀敏感性的影响.结果表明，疲劳预形变（切应力幅γｐｌ＝１.２×１０－４，疲劳周次Ｎ＝８．４×１０４；以及γｐｌ＝９．４×１０－４； Ｎ＝２．４×１０４）能降低Ｃｕ单晶的应力腐蚀敏感性．随拉伸预形变量升高，纯铜多品的应力腐蚀敏感性也降低.这表明，预形变能改善纯铜的应力腐蚀性能．Slow-strain-rate tests in NaNO2 solution were performed to determine the effect of cyclic and monotonic prestraining on the stress corrosion cracking (SCC) susceptibility of pure copper. The results showed that prestraining in fatigue (1= 1.2x 10-4, N=8.4x 104 and l=9.4x 10-4, N=2.4x104) decreased the SCC susceptibility of copper single crystals. Increasing monotonic prestraining increased SCC resistance of copper polycrystals. The results suggest that prestrain can improve the resistance to SCC of copper.

关 键 词：预形变 疲劳 应力腐蚀敏感性 纯铜 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG172.9[金属学及工艺—金属材料]