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Microstructure and mechanical property of austenitic steel Cr18Ni3Mn11Cu3NbN |
1.School of Material Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081, China) |
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Abstract In order to study the microstructure and mechanical property of a newly developed austenitic stainless steel Cr18Ni3Mn11Cu3NbN, the metallographic microstructure and fracture morphology were analysed, and the shorttime tensile properties at roomtemperarure and elevatedtemperature were also detected. The metallographic analysis showed that NbN compounds were distributed in austenitic matrix, thereinto a few of them were precipitated as cluster. At the same time, a small amount of elevatedtemperature ferrite and pure Nb phases were also presented. The fracture analysis showed that equiaxed dimples were at the fracture surface, indicating the existence of toughness fracture. In addition, the roomtemperature mechanical properties of the steel could meet the standard ASME Code Case 2328-1, thereinto, its tensile strength was much larger than the standard value, the hightemperature tensile strength was greater than that of the Super304H steel, but the elongation was less because of the existence of a small amount of elevatedtemperature ferrite.
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