Analysis of the Low Cycle Fatigue Behavior of DP980 Steel Gas Metal Arc Welded Joints
Dual phase (DP) steels have high strength, while maintaining outstanding elongation capacities. This is possible using a well-controlled thermomechanical process that produces a perfect phase combination in the DP microstructures. However, automotive makers are required to weld the DP steels, which...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-02-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/12/3/419 |
| _version_ | 1797445023435849728 |
|---|---|
| author | Juliana G. Rosado-Carrasco Walter F. González-Zapatero Christian J. García César M. Gómora David Jaramillo Ricardo R. Ambriz |
| author_facet | Juliana G. Rosado-Carrasco Walter F. González-Zapatero Christian J. García César M. Gómora David Jaramillo Ricardo R. Ambriz |
| author_sort | Juliana G. Rosado-Carrasco |
| collection | DOAJ |
| description | Dual phase (DP) steels have high strength, while maintaining outstanding elongation capacities. This is possible using a well-controlled thermomechanical process that produces a perfect phase combination in the DP microstructures. However, automotive makers are required to weld the DP steels, which generates a soft zone in the microstructure. In this work, 1.6 mm-thick DP980 steel sheets were welded by gas metal arc welding process to analyze the response of the welded soft zone to cyclic loading conditions. Conducted macrographic and metallography analyses revealed good quality in the appearance of the welded joints, with a complete fusion of the DP980 joint and without the presence of discontinuities. Low cycle fatigue tests of the DP welded joints were conducted under a constant amplitude strain control mode. The welded joints experienced a fatigue life reduction with respect to the DP980 steel of ~16% at strain amplitudes of 0.2, 0.3, and 0.4%. For strain amplitudes larger than 0.6%, the fatigue life of the welded joint was reduced by 39%. Weld thermal cycles combined with metallography analysis indicated that a tempered process of the martensite during the welding was responsible for the soft-zone formation and the poor fatigue response. |
| first_indexed | 2024-03-09T13:20:49Z |
| format | Article |
| id | doaj.art-d5c30e60877743268f21e5124d9a10e1 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T13:20:49Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-d5c30e60877743268f21e5124d9a10e12023-11-30T21:30:54ZengMDPI AGMetals2075-47012022-02-0112341910.3390/met12030419Analysis of the Low Cycle Fatigue Behavior of DP980 Steel Gas Metal Arc Welded JointsJuliana G. Rosado-Carrasco0Walter F. González-Zapatero1Christian J. García2César M. Gómora3David Jaramillo4Ricardo R. Ambriz5Instituto Politécnico Nacional CIITEC-IPN, Cerrada de Cecati S/N Col. Sta. Catarina, Azcapotzalco, Mexico City 02250, MexicoInstituto Politécnico Nacional CIITEC-IPN, Cerrada de Cecati S/N Col. Sta. Catarina, Azcapotzalco, Mexico City 02250, MexicoInstituto Politécnico Nacional CIITEC-IPN, Cerrada de Cecati S/N Col. Sta. Catarina, Azcapotzalco, Mexico City 02250, MexicoInstituto Politécnico Nacional CIITEC-IPN, Cerrada de Cecati S/N Col. Sta. Catarina, Azcapotzalco, Mexico City 02250, MexicoInstituto Politécnico Nacional CIITEC-IPN, Cerrada de Cecati S/N Col. Sta. Catarina, Azcapotzalco, Mexico City 02250, MexicoInstituto Politécnico Nacional CIITEC-IPN, Cerrada de Cecati S/N Col. Sta. Catarina, Azcapotzalco, Mexico City 02250, MexicoDual phase (DP) steels have high strength, while maintaining outstanding elongation capacities. This is possible using a well-controlled thermomechanical process that produces a perfect phase combination in the DP microstructures. However, automotive makers are required to weld the DP steels, which generates a soft zone in the microstructure. In this work, 1.6 mm-thick DP980 steel sheets were welded by gas metal arc welding process to analyze the response of the welded soft zone to cyclic loading conditions. Conducted macrographic and metallography analyses revealed good quality in the appearance of the welded joints, with a complete fusion of the DP980 joint and without the presence of discontinuities. Low cycle fatigue tests of the DP welded joints were conducted under a constant amplitude strain control mode. The welded joints experienced a fatigue life reduction with respect to the DP980 steel of ~16% at strain amplitudes of 0.2, 0.3, and 0.4%. For strain amplitudes larger than 0.6%, the fatigue life of the welded joint was reduced by 39%. Weld thermal cycles combined with metallography analysis indicated that a tempered process of the martensite during the welding was responsible for the soft-zone formation and the poor fatigue response.https://www.mdpi.com/2075-4701/12/3/419DP980 steel sheetlow cycle fatiguegas metal arc weldingheat affected zonetempered martensite |
| spellingShingle | Juliana G. Rosado-Carrasco Walter F. González-Zapatero Christian J. García César M. Gómora David Jaramillo Ricardo R. Ambriz Analysis of the Low Cycle Fatigue Behavior of DP980 Steel Gas Metal Arc Welded Joints Metals DP980 steel sheet low cycle fatigue gas metal arc welding heat affected zone tempered martensite |
| title | Analysis of the Low Cycle Fatigue Behavior of DP980 Steel Gas Metal Arc Welded Joints |
| title_full | Analysis of the Low Cycle Fatigue Behavior of DP980 Steel Gas Metal Arc Welded Joints |
| title_fullStr | Analysis of the Low Cycle Fatigue Behavior of DP980 Steel Gas Metal Arc Welded Joints |
| title_full_unstemmed | Analysis of the Low Cycle Fatigue Behavior of DP980 Steel Gas Metal Arc Welded Joints |
| title_short | Analysis of the Low Cycle Fatigue Behavior of DP980 Steel Gas Metal Arc Welded Joints |
| title_sort | analysis of the low cycle fatigue behavior of dp980 steel gas metal arc welded joints |
| topic | DP980 steel sheet low cycle fatigue gas metal arc welding heat affected zone tempered martensite |
| url | https://www.mdpi.com/2075-4701/12/3/419 |
| work_keys_str_mv | AT julianagrosadocarrasco analysisofthelowcyclefatiguebehaviorofdp980steelgasmetalarcweldedjoints AT walterfgonzalezzapatero analysisofthelowcyclefatiguebehaviorofdp980steelgasmetalarcweldedjoints AT christianjgarcia analysisofthelowcyclefatiguebehaviorofdp980steelgasmetalarcweldedjoints AT cesarmgomora analysisofthelowcyclefatiguebehaviorofdp980steelgasmetalarcweldedjoints AT davidjaramillo analysisofthelowcyclefatiguebehaviorofdp980steelgasmetalarcweldedjoints AT ricardorambriz analysisofthelowcyclefatiguebehaviorofdp980steelgasmetalarcweldedjoints |