템퍼링 조건이 마르텐사이트계 고강도강의 수소확산거동에 미치는 영향
Effect of Tempering Condition on Hydrogen Diffusion Behavior of Martensitic High-Strength Steel
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Martensitic high-strength steels revealed superior mechanical properties of high tensile strength exceeding1000 Mpa, and have been applied in a variety of industries. When the steels are exposed to corrosiveenvironments, however, they are susceptible to hydrogen embrittlement (HE), resulting in catastrophiccracking failure. To improve resistance to HE, it is crucial to obtain significant insight into the exactphysical nature associated with hydrogen diffusion behavior in the steel. For martensitic steels, temperingcondition should be adjusted carefully to improve toughness. The tempering process involvesmicrostructural modifications, that provide changes in hydrogen diffusion/trapping behavior in the steels. From this perspective, this study examined the relationship between tempering condition and hydrogendiffusion behavior in the steels. Results based on glycerin measurements and hydrogen permeationevaluations indicated that hydrogen diffusion/trapping behavior was strongly affected by the characteristicsof precipitates, as well as by metallurgical defects such as dislocation. Tempering condition shouldbe adjusted properly by considering required mechanical properties and resistance to HE.
Abstract
Martensitic high-strength steels revealed superior mechanical properties of high tensile strength exceeding1000 Mpa, and have been applied in a variety of industries. When the steels are exposed to corrosiveenvironments, however, they are susceptible to hydrogen embrittlement (HE), resulting in catastrophiccracking failure. To improve resistance to HE, it is crucial to obtain significant insight into the exactphysical nature associated with hydrogen diffusion behavior in the steel. For martensitic steels, temperingcondition should be adjusted carefully to improve toughness. The tempering process involvesmicrostructural modifications, that provide changes in hydrogen diffusion/trapping behavior in the steels. From this perspective, this study examined the relationship between tempering condition and hydrogendiffusion behavior in the steels. Results based on glycerin measurements and hydrogen permeationevaluations indicated that hydrogen diffusion/trapping behavior was strongly affected by the characteristicsof precipitates, as well as by metallurgical defects such as dislocation. Tempering condition shouldbe adjusted properly by considering required mechanical properties and resistance to HE.
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