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H6 8黃銅管夾安裝數(shù)月后出現(xiàn)開裂。對開裂的管夾進行了化學(xué)成分、力學(xué)性能、斷口及金相組織的檢驗與分析。結(jié)果表明 ,由于管夾成形時存在的殘余應(yīng)力和成形模具的設(shè)計問題而造成的裝配應(yīng)力 ,再加上管夾在露天放置受到的環(huán)境腐蝕 ,導(dǎo)致管夾在同一外側(cè)呈現(xiàn)應(yīng)力腐蝕開裂特征。提出了改進措施 ,并取得了滿意的效果
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Designation: B 68 –02 Standard Speci?cation for Seamless Copper Tube, Bright Annealed 1 This standard is issued under the ?xed designation B 68; the number immediately following the designation indicates the year of original adoption or, in the caseof revision, the year of last revision. A number in parenthesesindicates the year of last reapproval. A superscript epsilon (e) indicates an editorial