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首页> 外文期刊>Revista de metalurgia >Aplicacion del ensayo miniatura de embutido para la evaluacion de la tenacidad a temperaturas criogenicas de aceros inoxidables austeniticos envejecidos isotermicamente
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Aplicacion del ensayo miniatura de embutido para la evaluacion de la tenacidad a temperaturas criogenicas de aceros inoxidables austeniticos envejecidos isotermicamente

机译：微型香肠试验在等温老化奥氏体不锈钢低温温度下的韧性评估中的应用

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摘要

Two types of austenitic stainless steels JJ1 and JN1 were isothermally aged at temperatures from 873 to 1173 K for 10 to 1000 min in order to study the microstructural evolution and its effect on fracture toughness at cryogenic temperatures. The Charpy V-Notch (CVN) and Small-Punch (SP)Testing methods were conducted at 77 K to evaluate the toughness of both solution treated and aged specimens. The fracture energy at 77 K determined for both methods showed a significant decrease with aging time for both steels. A linear correlation between the fracture energies of both methods was found. The intergranular precipitation of carbides and nitrides was responsible for the fracture toughness deterioration. The scanning electron microscope fractographs showed an intergranular brittle fracture and its fraction also increased with aging time and temperature. The presence of a more abundant intergranular precipitation resulted in a more rapid decrease in fracture toughness with aging time in JN1 steel due to its higher content of C and N, compared to that of JJ1 steel.
机译：两种奥氏体不锈钢JJ1和JN1在873至1173 K的温度下等温老化10至1000分钟，以研究低温下的显微组织演变及其对断裂韧性的影响。夏比V型缺口（CVN）和小穿孔（SP）测试方法在77 K下进行，以评估固溶和老化试样的韧性。两种方法测定的77 K时的断裂能均随时效时间显着降低。发现两种方法的断裂能之间存在线性关系。碳化物和氮化物的晶间析出是断裂韧性劣化的原因。扫描电子显微镜断口扫描仪显示出晶间脆性断裂，并且其分数也随着老化时间和温度而增加。与JJ1钢相比，由于JN1钢中的C和N含量较高，因此，随着时效时间的延长，晶间析出量的增加导致断裂韧性的下降更快。

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