长时服役后HR3C耐热钢的微观组织与拉伸性能变化研究

Research on Microstructure Evolution and Tensile Property Changeof Austenitic Heat-resistant Steel after Long-term Service

碳中和技术成为火力发电的最有效解决方式之一,HR3C奥氏体耐热钢因其具有优异的高温性能而成为超超临界机组使用的典型高温部件材料。采用SEM、TEM、EBSD等技术对未服役样品和服役时长分别为35564、67705 h的样品进行微观组织观察,同时对几种材料的室温拉伸和高温拉伸性能进行了测量。结果表明:HR3C耐热钢具有良好的高温稳定性,在晶粒组及能源革命的大背景下,超超临界发电织与未服役样品一致,仍为孪晶奥氏体组织。此外,服役后HR3C的大角晶界处出现连续分布的M23C6相,并在晶界附近观察到纳米级NbCrN相。长时服役后其室温拉伸性能和高温拉伸性能与未服役样品并无明显变化。

Carbon neutral technology has become one of the most effective solutions for thermal power generation.HR3C austenitic heat-resistant steel has become a typical material for high-temperature components used in ultra-supercritical units because of its excellent high-temperature performance.SEM,TEM and EBSD techniques were used to observe the microstructure of the unserved samples and samples with 35564 h and 67705 h of service,respectively,while the room temperature tensile and high temperature tensile properties of several materials were measured.The results show that HR3C heat-resistant steel has good high-temperature stability,and the grain structure is consistent with that of the unserved sample.The tensile properties and tensile properties do not change significantly with the non-serviced samples at room-temperature and high-temperature.