摘要
通过试验，研究了模拟钢焊接接头的非均匀体在３．５％ＮａＣｌ溶液中的应力腐蚀开裂（ＳＣＣ）行为，讨论了力学不均匀性对应力腐蚀开裂行为的影响规律，发现：（１）由于力学不均匀性的影响，由４３４０钢、１６Ｍｎ钢和Ａ３钢组成的不均匀体，其应力腐蚀裂纹的扩展速率降低；（２）不均匀体发生ＳＣＣ的断口形貌为（沿晶＋少量撕裂纹）的混合型断口，应力强度因子Ｋ值较高或硬夹层较窄时，撕裂纹数量增加。（３）１６Ｍｎ钢和４３４０钢组成的ＭＨ不均匀体中的裂纹距软硬区界面较近时，裂纹扩展时将向软区偏转。
The iuflunce of inhomogeneity on stress corrssion cracking(SCC)was studied,whichsimulate the welded joints of steel,and the roles of inhomogeneity on the stress corrosioncracking were also discussed. The conclusions are:(1) The crack growth rate of iuhomogeneousbodies which consist of 4340 steel,16Mn steel and A3 steel decreases attribute to theinhomogeneity.(2) The fractogragh of inhomogeneous bodies are of mixed fracture feature(intergranular+tear grain).The higher the stress intensity factor or the narrower the hard layer,the more tear grains are.(3) In condition the inhomogeneous bodies are MH type,crackgrowth Will turn toward the soft region.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
1994年第4期262-268,共7页
Transactions of The China Welding Institution
关键词
应力腐蚀
裂纹扩展
断口
焊接接头
iuhomogeneous body
stress corrosion cracking,crack growth
fractograph
