熱處理工藝對17-4PH鋼耐海水腐蝕性能的影響

熱處理工藝對17-4PH鋼耐海水腐蝕性能的影響EFFECT OF HEAT TREATMENT PROCESSES ON SEAWATER CORROSION RESISTANCE PROPERTY OF 17-4PH STEEL

運用極化曲線、循環(huán)極化曲線等電化學方法研究了17-4PH鋼經不同工藝熱處理后的耐海水腐蝕性能，并對腐蝕形貌和顯微組織進行了觀察和分析。結果表明：該不銹鋼經固溶+調整處理后，在520℃時效4 h時可獲最佳的耐海水腐蝕性能，且綜合力學性能優(yōu)良。在一定的溫度和時間區(qū)間內，隨著時效溫度的升高及時效時間的延長，馬氏體板條呈逐步細化的趨勢且晶間析出物逐漸增多。在不同溫度及時間的時效處理過程中，富Cu沉淀相的析出、長大及逆轉變奧氏體的產生是導致其耐蝕性產生差異的主要原因。

The corrosion resistance property in artificial seawater of 17-4PH steel after different heat treatment processes was investigated by electrochemical tests, and the corrosion morphology and microstructure were also analyzed. The results indicated that after solution and intermediate treatments the steel showed the best corrosion resistance property and excellent mechanical properties while aging at 520℃ for 4 hours. The microstructure became finer and the precipitation in grain boundaries increased with the increase of aging temperature and time in a certain range. The reverted austenite and copper precipitates that separated out while aging treatment were the major determinants of the corrosion resistance property of 17-4PH steel.

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