文献类型：期刊文献

英文题名：Revealing influence of warm bending on creep performance of heat-resistant 2.25Cr-1Mo-0.25 V steel

作者：Li, You[1];Huang, Song[2];Hui, Hu[2];Han, Yile[2];Huang, Jiayi[1];Chen, Zhiping[1]

机构：[1]Zhejiang Univ, Inst Proc Equipment, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China;[2]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2023

卷号：58

期号：8

起止页码：3802

外文期刊名：JOURNAL OF MATERIALS SCIENCE

收录：;EI(收录号：20230713580746);WOS:【SCI-EXPANDED(收录号:WOS:000932713600003)】；

基金：This research is supported by National Natural Science Foundation of China (Grand No. 51905173). We sincerely thank Shanghai Yinghua Testing Co., Ltd. for providing the device of GE Phoenix Nanotom M and the commercial software of VG Studio MAX 3.4. We acknowledge Jie Tang for his help during the -XCT tests.

语种：英文

外文关键词：Bending tests - Carbides - Coarsening - Computerized tomography - Creep resistance - Deterioration - Fracture mechanics - Ostwald ripening

摘要：2.25Cr-1Mo-0.25 V steel has been widely used to manufacture hydro-processing equipment operating under harsh environments for its good creep performance. Warm bending, a common fabricating process of 2.25Cr-1Mo-0.25 V steel ring shells, inevitably changes the creep property of 2.25Cr-1Mo-0.25 V steel, but its detailed effect still remains obscure. In this work, we experimentally investigated the impact of warm bending on the microstructure and creep behavior of 2.25Cr-1Mo-0.25 V steel. First, a series of creep rupture tests were carried out at 482 & DEG;C and 350 MPa, in which test materials were extracted from an actually fabricated ring shell and its raw plate. Thereafter, the microstructures of test materials were semi-quantitatively analyzed by various characterization techniques, such as electron backscatter diffraction (EBSD) and three-dimensional high-resolution X-ray computed tomography (3D mu-XCT). Finally, warm forming induced microstructural degradation as well as their implication for creep was discussed in detail. Creep rupture tests showed that warm bending leads to a significant decrease in creep lifetime at the surface region of virgin plate but a slight decline at the central region of virgin plate. An inhomogeneous creep resistance distribution was thereby revealed along the thickness direction of the ring shell, which could not be completely eliminated by subsequent tempering at 705 & DEG;C for 8 h. Moreover, microstructural observations demonstrated that warm deformation leads to multiple microstructural deterioration, including carbide coarsening, ferrite matrix softening, void defect increasing, etc. Their combined action appears to accelerate the creep fracture behavior of 2.25Cr-1Mo-0.25 V steel. This work will contribute to the long-term safety and integrity assessment of 2.25Cr-1Mo-0.25 V steel structures.