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通过对X52钢进行热处理获得三种不同组织。SEM观察发现三种组织分别为铁素体/带状珠光体、马氏体/贝氏体和针状铁素体/回火马氏体。通过动电位极化、线性极化电阻、氢致开裂(HIC)实验和硫化物应力腐蚀开裂(SSC)实验,研究了不同热处理对X52钢在H_2S环境中的腐蚀与开裂行为的影响。结果表明马氏体/贝氏体显微组织由于位错密度很高且脆性大,因而腐蚀速率及HIC和SSC敏感性很高。铁素体/带状珠光体组织和针状铁素体/回火马氏体组织腐蚀速率及HIC和SSC敏感性很低。针状铁素体/回火马氏体组织由于不含带状组织且晶粒细小以及碳化物的析出,因此其HIC和SSC抗性优于铁素体/带状珠光体组织。
Three different tissues were obtained by heat treatment of X52 steel. SEM observation showed that the three kinds of microstructure were ferrite / ribbon pearlite, martensite / bainite and acicular ferrite / tempered martensite, respectively. The effects of different heat treatments on corrosion and cracking behavior of X52 steel in H_2S environment were studied by potentiodynamic polarization, linear polarization resistance, HIC and SSC experiments. The results show that the martensite / bainitic microstructure is highly susceptible to corrosion and HIC and SSC due to its high dislocation density and large brittleness. Ferritic / zonal pearlite and acicular ferrite / tempered martensite have a low rate of tissue erosion and HIC and SSC sensitivity. The acicular ferrite / tempered martensite has better HIC and SSC resistance than ferrite / zonal pearlite due to its absence of banded and fine grains and carbide precipitation.