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某安裝工程中作為承力構(gòu)件的17-4PH不銹鋼拉桿在使用過(guò)程中發(fā)生斷裂,對(duì)失效拉桿進(jìn)行化學(xué)成分分析、斷口形貌和金相組織觀察以及力學(xué)性能測(cè)試,并與完好拉桿進(jìn)行了對(duì)比分析。結(jié)果表明:不銹鋼拉桿是在腐蝕及應(yīng)力的共同作用下發(fā)生了應(yīng)力腐蝕斷裂;由于熱處理不當(dāng),導(dǎo)致失效拉桿中塊狀δ-鐵素體的大量存在,時(shí)效過(guò)程中晶界上碳化物的析出造成材料抗腐蝕能力下降,以及材質(zhì)"硬脆"共同導(dǎo)致拉桿發(fā)生斷裂。
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Stainless steel Brushed stainless steel comes in various finishes. No. 3 and No. 4 are typical. These finishes are hard to repair when scratches appears. Another brush finish is the HairLine finish. The advantage of this finish is that the grain is continuous and runs the length of the sheet. The importance of continuous long grain HairLine finish is to allow for repair of minor scratches. On
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