控轧控冷微合金钢组织与抗腐蚀性能研究
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摘要
本课题选用X70钢、X80钢、15CrMoR钢和16MnR钢等4种微合金钢,针对其实际服役环境特点及主要的腐蚀失效形式,采用不同体系的腐蚀液和腐蚀测试方法,研究4种钢的耐腐蚀性能及在各自腐蚀环境体系中的腐蚀规律和腐蚀机理。根据X70钢、X80钢在含不同Cl- (0.05mol/L, 0.1mol/L、0.2mol/L、0.5mol/L、1.0mol/L)浓度溶液和在含0.5mol/LCl-溶液中加不同SO42- (0.05mol/L、0.5mol/L) l.Omol/L)浓度溶液中的极化曲线,以及不同Cl-和SO42-浓度(0.23%Cl-+0.1%SO42-、0.23%Cl-+1.0%SO42-2.3%Cl-+0.1%SO42-、2.3%Cl-+10.%SO42-)溶液中的电化学阻抗谱,结合金相显微镜分析腐蚀试样表面,利用SEM、TEM分析其组织结构,探究2种钢在西部典型盐碱性土壤模拟液中的腐蚀规律和耐腐蚀性的组织因素。基于4种钢在饱和H2S溶液中的氢致开裂(HIC)试验结果,根据其HIC的裂纹长度率、宽度率、敏感率,研究合金元素、夹杂物、组织形貌对4种钢在H2S环境中的HIC成因及裂纹扩展方式的影响。在饱和H2S溶液中对4种钢进行硫化物应力腐蚀开裂(SSCC)试验,结合成分和组织形貌分析,研究4种钢在H2S环境中的SSCC行为,运用恒载荷拉伸和四点弯曲方法测量了4种钢的SSCC门槛应力值。结果表明,X70钢对Cl-和SO42-的作用更为敏感,X80钢在腐蚀液中的耐腐蚀性能更好；在X70钢和15CrMoR钢中未发现氢致裂纹,X80钢裂纹率很小,具有优良的抗HIC性能,16MnR钢裂纹率高,不具备抗HIC性能；X70钢和15CrMoR钢的SSCC门槛应力值最高,X80钢次之,16MnR钢最低。
In this paper, different corrosion testing methods according to practical service environment and the main corrosion failure modes have been used to study the corrosion resistance, the corrosion rule and corrosion mechanism of X70 steel, X80 steel,15CrMoR steel and 16MnR steel in their respective corrosion environment systems. Polarization curves of X70 steel and X80 steel in different Cl- (0.05mol/L, 0.1mol/L, 0.2mol/L,0.5mol/L, 1.0mol/L) concentration solution and 0.5mol/L Cl-concentration solution by adding solution of different SO42" (0.05mol/L, 0.5mol/L, 1.0mol/L) concentrations were measured respectively. Also electrochemical impedance spectroscopy of X70 steel and X80 steel in different Cl- and SO42- concentration (0.23%Cl-+0.1%SO42-,0.23%Cl-+1.0%SO42-,2.3%Cl-+0.1%SO42-,2.3%Cl-+1.0%SO42-) were measured respectively corrosion mechanism and the effect of microstructure of the two steels on corrosion resistance were investigated in simulated typical saline and alkali soil of western areas solution. Hydrogen induced cracking (HIC) experiments in saturated H2S solution of the four steels were carried out to measure the crack length ratio, crack width ratio and sensitive ratio. The cause of HIC and the mode of crack propagation of the four kinds of steels mentioned above in H2S environment were also studied by alloying elements and inclusions analyzing and microstructure observation. Sulfide stress corrosion cracking (SSCC) in saturated H2S solution of steels the four steels were carried out and the critical stress value of SSCC were also measured by means of tensile test at constant load and three-point bending to investigate the SSCC behavior. The results show that the X70 steel is more sensitive to the role of Cl- and SO42- than X80 steel, and therefore the corrosion resistance of the X80 steel in the corrosive liquid is better. For the 15CrMoR steel and X70 steel, there was no hydrogen-induced cracking phenomenon observed, and the crack rate of the X80 steel is very small, which indicates that the three steels has excellent corrosion resistance to HIC.16MnR steel has bad corrosion resistance to HIC owing to its high crack rate. The critical stress value of SSCC of X70 steel and 15CrMoR steel is the highest in the four steels, and that of X80 steel is higher than 16MnR steel.
In this paper, different corrosion testing methods according to practical service environment and the main corrosion failure modes have been used to study the corrosion resistance, the corrosion rule and corrosion mechanism of X70 steel, X80 steel,15CrMoR steel and 16MnR steel in their respective corrosion environment systems. Polarization curves of X70 steel and X80 steel in different Cl- (0.05mol/L, 0.1mol/L, 0.2mol/L,0.5mol/L, 1.0mol/L) concentration solution and 0.5mol/L Cl-concentration solution by adding solution of different SO42" (0.05mol/L, 0.5mol/L, 1.0mol/L) concentrations were measured respectively. Also electrochemical impedance spectroscopy of X70 steel and X80 steel in different Cl- and SO42- concentration (0.23%Cl-+0.1%SO42-,0.23%Cl-+1.0%SO42-,2.3%Cl-+0.1%SO42-,2.3%Cl-+1.0%SO42-) were measured respectively corrosion mechanism and the effect of microstructure of the two steels on corrosion resistance were investigated in simulated typical saline and alkali soil of western areas solution. Hydrogen induced cracking (HIC) experiments in saturated H2S solution of the four steels were carried out to measure the crack length ratio, crack width ratio and sensitive ratio. The cause of HIC and the mode of crack propagation of the four kinds of steels mentioned above in H2S environment were also studied by alloying elements and inclusions analyzing and microstructure observation. Sulfide stress corrosion cracking (SSCC) in saturated H2S solution of steels the four steels were carried out and the critical stress value of SSCC were also measured by means of tensile test at constant load and three-point bending to investigate the SSCC behavior. The results show that the X70 steel is more sensitive to the role of Cl- and SO42- than X80 steel, and therefore the corrosion resistance of the X80 steel in the corrosive liquid is better. For the 15CrMoR steel and X70 steel, there was no hydrogen-induced cracking phenomenon observed, and the crack rate of the X80 steel is very small, which indicates that the three steels has excellent corrosion resistance to HIC.16MnR steel has bad corrosion resistance to HIC owing to its high crack rate. The critical stress value of SSCC of X70 steel and 15CrMoR steel is the highest in the four steels, and that of X80 steel is higher than 16MnR steel.
引文
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[5]陈明香,胡儒卓,李润洪.微合金钢的开发与研究[J].钢管,2002,31(4)：14-15.
[6]侯晶,王飞,赵国英,等.微合金钢的研究现状及发展趋势[J].材料导报,2007,21(6)：91-92.
[7]G. Q. Liu, F. M. Wang, Z. B. Wang, et al. HSLA Steels 2000[C].Beijing: Metallurgical Industry Press,2000:11-13.
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[12]Y. Q. Zhang, H. Q. Zhang, J. F. Li, et al. Effect of Heat Input on Microstructure and Toughness of Coarse Grain Heat Affected Zone in Nb Microalloyed HSLA Steels[J]. Journal of Iron and Steel Research, International,2009,16(5):73-80.
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