{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,14]],"date-time":"2026-09-14T05:02:34Z","timestamp":1789362154669,"version":"build-2803163510"},"reference-count":29,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T00:00:00Z","timestamp":1788998400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100012166","name":"National Key R&amp;D Program of China","doi-asserted-by":"publisher","award":["No. 2024YFB4105000"],"award-info":[{"award-number":["No. 2024YFB4105000"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>The creep-rupture behavior and microstructural evolution of Ni\u2013Fe-based alloy\/Inconel 617 dissimilar welded joints were investigated by creep-rupture testing, interrupted creep testing, and microstructural characterization. Tests were conducted at 630\u2013750 \u00b0C under stresses of 130\u2013375 MPa. All joint specimens fractured in the heat-affected zone (HAZ) or base metal (BM) on the Ni\u2013Fe-based alloy side, indicating that the Ni\u2013Fe-based alloy side was the creep-critical region of the joint. Three failure regimes were identified according to the relative rupture lives of the joints and the Ni\u2013Fe-based alloy BM. Fractographic observations revealed predominantly intergranular fracture, with creep cavities and cracks preferentially associated with grain-boundary discontinuous precipitation (DP) regions containing coarsened rod-like \u03b3\u2032 precipitates and precipitate-free zones (PFZs). Differences in DP evolution between the HAZ and BM were closely related to creep-damage localization and failure behavior. Interrupted creep tests showed that temperature was the dominant factor affecting DP formation and growth, while applied stress accelerated its evolution. DP developed rapidly during the initial exposure stage and subsequently grew more slowly. These findings clarify the relationship between grain-boundary DP evolution and creep-rupture failure in Ni\u2013Fe-based alloy\/Inconel 617 welded joints, and also provide microstructural guidance for assessing and mitigating creep degradation in dissimilar welded components used in high-temperature A-USC systems. Future work should combine longer-term creep testing, phase-resolved microstructural characterization, and predictive modeling to establish quantitative relationships among DP evolution, creep-damage accumulation, and rupture life.<\/jats:p>","DOI":"10.3390\/ma19183859","type":"journal-article","created":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T13:04:57Z","timestamp":1789045497000},"page":"3859","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Effect of Grain-Boundary Discontinuous Precipitation Evolution on the Transition of Creep-Rupture Failure Modes in Ni\u2013Fe-Based Alloy\/Inconel 617 Dissimilar Welded Joints"],"prefix":"10.3390","volume":"19","author":[{"given":"Linshu","family":"Li","sequence":"first","affiliation":[{"name":"Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shengzhi","family":"Li","sequence":"additional","affiliation":[{"name":"Shanghai Turbine Plant, Shanghai Electric Power Generation Equipment Co., Ltd., Shanghai 200240, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Manjie","family":"Fan","sequence":"additional","affiliation":[{"name":"Shanghai Turbine Plant, Shanghai Electric Power Generation Equipment Co., Ltd., Shanghai 200240, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jun","family":"Cheng","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wuhua","family":"Zhang","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xin","family":"Huo","sequence":"additional","affiliation":[{"name":"Shanghai Turbine Plant, Shanghai Electric Power Generation Equipment Co., Ltd., Shanghai 200240, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xia","family":"Liu","sequence":"additional","affiliation":[{"name":"Shanghai Turbine Plant, Shanghai Electric Power Generation Equipment Co., Ltd., Shanghai 200240, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kejian","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China"},{"name":"State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China"},{"name":"Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhipeng","family":"Cai","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China"},{"name":"State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China"},{"name":"Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qu","family":"Liu","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China"},{"name":"Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"175843","DOI":"10.1016\/j.jallcom.2024.175843","article-title":"Microstructural evolution and creep behavior of a novel Ni\u2013Fe-based superalloy GH2070P for 700 \u00b0C class A-USC steam pipes","volume":"1004","author":"Yu","year":"2024","journal-title":"J. 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