{"meta":{"id":"https:\/\/api.iclient.ifeng.com\/ipadtestdoc?aid=ucms_7z44pVG9NAs","type":"doc","o":"1","documentId":"ucms_7z44pVG9NAs"},"body":{"newStatus":"1","documentId":"ucms_7z44pVG9NAs","staticId":"ucms_7z44pVG9NAs","title":"螺柱断裂缺陷应力腐蚀分析","shareTitle":"螺柱断裂缺陷应力腐蚀分析","thumbnail":"http:\/\/d.ifengimg.com\/w150_h106_q100\/img1.ugc.ifeng.com\/newugc\/20200819\/16\/wemedia\/e4ec1d45419fe13352b2a5c401ce984057ceca0a_size20_w261_h174.jpeg","source":"","author":"","editorcode":"weMedia","editTime":"2020-08-19 16:40:10","updateTime":"2020\/08\/19 16:40:10","wapurl":"http:\/\/\/\/feng.ifeng.com\/c\/7z44pVG9NAs","introduction":"","wwwurl":"http:\/\/\/\/feng.ifeng.com\/c\/7z44pVG9NAs","commentsUrl":"ucms_7z44pVG9NAs","commentCount":0,"text":"
(1)42CrMo钢双头螺柱应力腐蚀断口形貌<\/p>
螺柱在螺纹收尾处的牙底断裂,断口微观形貌为沿晶、穿晶混合断口,有较多二次裂纹,并有被腐蚀的区域。裂源区为颜色较深无光泽的腐蚀区域,扩展区微观形貌为准解理及少量二次裂纹,瞬断区呈韧窝形貌,呈应力腐蚀断口特征。<\/p>
由于在工作环境中螺柱受到腐蚀,其应力集中处产生了应力腐蚀裂纹,应力腐蚀裂纹的两侧成为腐蚀区域,颜色较深无光泽;裂纹进一步扩展双头螺柱断裂,见图9-82、图9-83和图9-84。<\/p>
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图9-82 裂源区电镜形貌 图9-83扩展区微观形貌<\/p>
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图9-84 瞬断区微观形貌<\/p>","img":[{"url":"http:\/\/d.ifengimg.com\/mw640_q100\/x0.ifengimg.com\/res\/2020\/95A5AC82E8AFA2D0062A8E61C2EFFB971FC3FD86_size36_w560_h198.jpeg","size":{"width":"560","height":"198"}},{"url":"http:\/\/d.ifengimg.com\/mw640_q100\/x0.ifengimg.com\/res\/2020\/FA139636DFEFC559E57CA254B61662987E4570A0_size20_w266_h188.jpeg","size":{"width":"266","height":"188"}}],"summary":"(1)42CrMo钢双头螺柱应力腐蚀断口形貌螺柱在螺纹收尾处的牙底断裂,断口微观形貌为沿晶、穿晶混合断口,有较多二次裂纹,并有被腐蚀的区域。裂源区为颜色较深无光","sharesummary":"(1)42CrMo钢双头螺柱应力腐蚀断口形貌螺柱在螺纹收尾处的牙底断裂,断口微观形貌为沿晶、穿晶混合断口,有较多二次裂纹,并有被腐蚀的区域。裂源区为颜色较深无光","commentType":"0","wemediaEAccountId":"1567545","showclient":"0","shareurl":"https:\/\/ishare.ifeng.com\/c\/s\/v002-_roLA-_KLgf--1Q4IKmc3--m8Q7s0wMNssDs6eIi1q9MJI__","praise":"0","like_num":"0"}}