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首页> 外文期刊>Journal of Materials Engineering and Performance >On the Microstructure-Polarization Behavior Correlation of a 9Cr-1Mo Steel Weld Joint
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On the Microstructure-Polarization Behavior Correlation of a 9Cr-1Mo Steel Weld Joint

机译：9Cr-1Mo钢焊接接头组织与极化行为的相关性

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摘要

The use of 9Cr-1Mo ferritic steel necessitates its fabrication by the process of welding. The heat-affected zone (HAZ) of 9Cr-1Mo ferritic steel is a combination of many microstructures. In the present study, the corrosion properties of the base metal, weld metal, and the various regions of the HAZ are assessed with respect to their microstructures. The various microstructures in the HAZ were simulated by heat treatment of the normalized and tempered base metal at 1463, 1200, and 1138 K for 5 min followed by oil quenching. The microstructure of the base metal in the normalized and tempered condition revealed martensite laths with M_(23)C_6 carbides at lath boundaries, and uniform dispersion of fine, acicular M_2C. the weld metal showed predominantly martensitic structure with dispersion of carbides. Simulation of the microstructures of the HAZ by heat treatment resulted in the following microstructure: coarse-grained martensite of 75 #mu#m size at 1463 K, fine-grained martensite at 1200 K, and martensite + Proeutectoid #alpha#-ferrite at 1138 K. in all cases, carbide precipitation was observed in the martensitic matric. Microhardness measurements of HAZ-simulated base metal showed increasing hardness with increasing heat treatment temperature. The hardness values obtained corresponded very well with the regions of the actual HAZ in the weld joint. Electrochemical polarization studies were carried out on the base metal, weld metal, weldments (base metal + weld metal + HAZ), and the simulated HAZ structures in 0.5 M sulfuric acid solution. Critical current densities (I_(critl) and I_(crit2)), passive current densities (I_(pass and I_(sec-pass))), and transpassive potential (E_(tp)) were the parameters considered for evaluating the corrosion resistance. The HAZ structures simulated at 1463 and 1200 K, corresponding to coarse-and fine-grained martensitic regions of an actual HAZ, had corrosion properties as the normalized and tempered base metal. Of the various simulated HAZ structures, the intercritical region, which was simulated at 1138 K, possessed the various microstructural regions in the weld joint. The weldments adopted the degraded corrosion properties of the weld metal
机译：9Cr-1Mo铁素体钢的使用需要通过焊接工艺进行制造。 9Cr-1Mo铁素体钢的热影响区（HAZ）是许多微结构的组合。在本研究中，根据其微观结构评估了母材，焊缝金属和热影响区各个区域的腐蚀性能。通过在1463、1200和1138 K对正火回火的贱金属进行5分钟的热处理，然后进行油淬火，来模拟HAZ中的各种微观结构。在正火和回火条件下，贱金属的显微组织显示出在板条边界处具有M_（23）C_6碳化物的马氏体板条，并且细小，针状M_2C均匀分散。焊缝金属主要表现为马氏体组织，且碳化物分散。通过热处理对热影响区的微观结构进行模拟，得出以下微观结构：1463 K处尺寸为75＃μm的粗晶粒马氏体，1200 K处的细晶粒马氏体和1138的马氏体+原共析＃α＃铁素体在所有情况下，在马氏体基质中均观察到碳化物沉淀。 HAZ模拟的贱金属的显微硬度测量结果表明，随着热处理温度的升高，硬度增加。获得的硬度值与焊接接头中实际HAZ的区域非常吻合。在0.5 M硫酸溶液中对贱金属，焊缝金属，焊件（贱金属+焊缝金属+ HAZ）和模拟的HAZ结构进行了电化学极化研究。临界电流密度（I_（critl）和I_（crit2）），无源电流密度（I_（pass和I_（sec-pass）））和跨源电位（E_（tp））是用于评估耐蚀性的参数。在1463和1200 K下模拟的热影响区结构，对应于实际热影响区的粗晶粒和细晶粒马氏体区，具有作为正火和回火母材的腐蚀性能。在各种模拟的热影响区结构中，在1138 K下模拟的临界区在焊接接头中具有各种微结构区。焊件采用了焊接金属劣化的腐蚀性能

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