Influence of Post-Weld Heat Treatment on the Mechanical Properties and Microstructure of a Seamless Pipe of an ASTM A335 Gr P91 Steel
This study investigates the effects of different post-weld heat treatments (PWHT) on the mechanical properties and microstructure of ASTM 335 Gr P91 martensitic steel, commonly used in boiler applications. Mechanical tests were conducted at room temperature, 300°C, and 600°C. Two PWHT conditions wer...
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Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
2025-03-01
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| Series: | Materials Research |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392025000100222&tlng=en |
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| author | Emerson André Pinto Bento Edwar Andrés Torres Aline Emanuelle Albuquerque Chemin Carla Isabel Dos Santos Maciel Alexandre Lourenção Caselatto Cassius Olívio Figueiredo Terra Ruchert Julian Arnaldo Avila |
| author_facet | Emerson André Pinto Bento Edwar Andrés Torres Aline Emanuelle Albuquerque Chemin Carla Isabel Dos Santos Maciel Alexandre Lourenção Caselatto Cassius Olívio Figueiredo Terra Ruchert Julian Arnaldo Avila |
| author_sort | Emerson André Pinto Bento |
| collection | DOAJ |
| description | This study investigates the effects of different post-weld heat treatments (PWHT) on the mechanical properties and microstructure of ASTM 335 Gr P91 martensitic steel, commonly used in boiler applications. Mechanical tests were conducted at room temperature, 300°C, and 600°C. Two PWHT conditions were applied: (i) PWHT-1, involving a 300°C isothermal treatment followed by heating to 770°C, and (ii) PWHT-2, following the same profile but without cooling to room temperature after the initial isothermal step. The resulting microstructure exhibited martensitic features, with a gradient of prior austenite grain boundaries in the heat-affected zone (HAZ) and δ-ferrite formation in the fusion zone (FZ), reducing toughness. Ultimate tensile strength decreased with increasing temperature, ranging from 675–750 MPa (RT), 525–615 MPa (300°C), and 375–440 MPa (600°C). Elongation was highest at 600°C (BM: 25–30%, FZ: 8–20%), decreasing at room temperature (BM: 20–25%, FZ: 2–12%). Toughness tests showed crack propagation across BM, HAZ, and FZ, with the lowest energy absorption in FZ (0.05–0.4 mm, 12–50 J). At 600°C, toughness decreased in BM and HAZ but increased in FZ, suggesting a change in deformation mechanisms at elevated temperatures. |
| format | Article |
| id | doaj-art-a1d99f51d83b4b5997d6ab3b5ea35b65 |
| institution | Kabale University |
| issn | 1516-1439 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
| record_format | Article |
| series | Materials Research |
| spelling | doaj-art-a1d99f51d83b4b5997d6ab3b5ea35b652025-08-20T03:44:35ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392025-03-012810.1590/1980-5373-mr-2024-0544Influence of Post-Weld Heat Treatment on the Mechanical Properties and Microstructure of a Seamless Pipe of an ASTM A335 Gr P91 SteelEmerson André Pinto BentoEdwar Andrés Torreshttps://orcid.org/0000-0002-7273-4017Aline Emanuelle Albuquerque Cheminhttps://orcid.org/0000-0002-1063-4029Carla Isabel Dos Santos Macielhttps://orcid.org/0000-0001-8393-9838Alexandre Lourenção CaselattoCassius Olívio Figueiredo Terra Rucherthttps://orcid.org/0000-0002-9912-0250Julian Arnaldo Avilahttps://orcid.org/0000-0002-5893-4725This study investigates the effects of different post-weld heat treatments (PWHT) on the mechanical properties and microstructure of ASTM 335 Gr P91 martensitic steel, commonly used in boiler applications. Mechanical tests were conducted at room temperature, 300°C, and 600°C. Two PWHT conditions were applied: (i) PWHT-1, involving a 300°C isothermal treatment followed by heating to 770°C, and (ii) PWHT-2, following the same profile but without cooling to room temperature after the initial isothermal step. The resulting microstructure exhibited martensitic features, with a gradient of prior austenite grain boundaries in the heat-affected zone (HAZ) and δ-ferrite formation in the fusion zone (FZ), reducing toughness. Ultimate tensile strength decreased with increasing temperature, ranging from 675–750 MPa (RT), 525–615 MPa (300°C), and 375–440 MPa (600°C). Elongation was highest at 600°C (BM: 25–30%, FZ: 8–20%), decreasing at room temperature (BM: 20–25%, FZ: 2–12%). Toughness tests showed crack propagation across BM, HAZ, and FZ, with the lowest energy absorption in FZ (0.05–0.4 mm, 12–50 J). At 600°C, toughness decreased in BM and HAZ but increased in FZ, suggesting a change in deformation mechanisms at elevated temperatures.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392025000100222&tlng=enPost-Weld Heat Treatment (PWHT)Martensitic CrMo SteelMechanical PropertiesMicrostructure EvolutionHigh-Temperature Performance |
| spellingShingle | Emerson André Pinto Bento Edwar Andrés Torres Aline Emanuelle Albuquerque Chemin Carla Isabel Dos Santos Maciel Alexandre Lourenção Caselatto Cassius Olívio Figueiredo Terra Ruchert Julian Arnaldo Avila Influence of Post-Weld Heat Treatment on the Mechanical Properties and Microstructure of a Seamless Pipe of an ASTM A335 Gr P91 Steel Materials Research Post-Weld Heat Treatment (PWHT) Martensitic CrMo Steel Mechanical Properties Microstructure Evolution High-Temperature Performance |
| title | Influence of Post-Weld Heat Treatment on the Mechanical Properties and Microstructure of a Seamless Pipe of an ASTM A335 Gr P91 Steel |
| title_full | Influence of Post-Weld Heat Treatment on the Mechanical Properties and Microstructure of a Seamless Pipe of an ASTM A335 Gr P91 Steel |
| title_fullStr | Influence of Post-Weld Heat Treatment on the Mechanical Properties and Microstructure of a Seamless Pipe of an ASTM A335 Gr P91 Steel |
| title_full_unstemmed | Influence of Post-Weld Heat Treatment on the Mechanical Properties and Microstructure of a Seamless Pipe of an ASTM A335 Gr P91 Steel |
| title_short | Influence of Post-Weld Heat Treatment on the Mechanical Properties and Microstructure of a Seamless Pipe of an ASTM A335 Gr P91 Steel |
| title_sort | influence of post weld heat treatment on the mechanical properties and microstructure of a seamless pipe of an astm a335 gr p91 steel |
| topic | Post-Weld Heat Treatment (PWHT) Martensitic CrMo Steel Mechanical Properties Microstructure Evolution High-Temperature Performance |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392025000100222&tlng=en |
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