TY - JOUR
T1 - Wire and arc additive manufacturing of HSLA steel: Effect of thermal cycles on microstructure and mechanical properties
AU - Rodrigues, Tiago A.
AU - Duarte, V.
AU - Avila, Julian A.
AU - Santos, Telmo G.
AU - Miranda, R. M.
AU - Oliveira, J. P.
N1 - TAR, VD, TGS, RMM, and JPO acknowledge Fundacao para a Ciencia e a Tecnologia (FCT - MCTES) for its financial support via the project UID/EMS/00667/2019.
VD acknowledges FCT - MCTES for funding the PhD grant SFRH/BD/139454/2018. Research supported by LNNano - Brazilian Nanotechnology National Laboratory, CNPEM/MCTIC.
PY - 2019/5/1
Y1 - 2019/5/1
N2 - Wire and arc additive manufacturing (WAAM) is a viable technique for the manufacture of large and complex dedicated parts used in structural applications. High-strength low-alloy (HSLA) steels are well-known for their applications in the tool and die industries and as power-plant components. The microstructure and mechanical properties of the as-built parts are investigated, and are correlated with the thermal cycles involved in the process. The heat input is found to affect the cooling rates, interlayer temperatures, and residence times in the 800–500 °C interval when measured using an infrared camera. The microstructural characterization performed by scanning electron microscopy reveals that the microstructural constituents of the sample remain unchanged. i.e., the same microstructural constituents—ferrite, bainite, martensite, and retained austenite are present for all heat inputs. Electron backscattered diffraction analysis shows that no preferential texture has been developed in the samples. Because of the homogeneity in the microstructural features of the as-built parts, the mechanical properties of the as-built parts are found to be nearly isotropic. Mechanical testing of samples shows excellent ductility and high mechanical strength. This is the first study elucidating on the effect of thermal cycles on the microstructure and mechanical properties during WAAM of HSLA steel.
AB - Wire and arc additive manufacturing (WAAM) is a viable technique for the manufacture of large and complex dedicated parts used in structural applications. High-strength low-alloy (HSLA) steels are well-known for their applications in the tool and die industries and as power-plant components. The microstructure and mechanical properties of the as-built parts are investigated, and are correlated with the thermal cycles involved in the process. The heat input is found to affect the cooling rates, interlayer temperatures, and residence times in the 800–500 °C interval when measured using an infrared camera. The microstructural characterization performed by scanning electron microscopy reveals that the microstructural constituents of the sample remain unchanged. i.e., the same microstructural constituents—ferrite, bainite, martensite, and retained austenite are present for all heat inputs. Electron backscattered diffraction analysis shows that no preferential texture has been developed in the samples. Because of the homogeneity in the microstructural features of the as-built parts, the mechanical properties of the as-built parts are found to be nearly isotropic. Mechanical testing of samples shows excellent ductility and high mechanical strength. This is the first study elucidating on the effect of thermal cycles on the microstructure and mechanical properties during WAAM of HSLA steel.
KW - Additive manufacturing
KW - High-strength low-alloy steels
KW - Mechanical properties
KW - Microstructure characterization
KW - Wire and arc additive manufacturing
UR - http://www.scopus.com/inward/record.url?scp=85063741549&partnerID=8YFLogxK
U2 - 10.1016/j.addma.2019.03.029
DO - 10.1016/j.addma.2019.03.029
M3 - Article
AN - SCOPUS:85063741549
VL - 27
SP - 440
EP - 450
JO - Additive Manufacturing
JF - Additive Manufacturing
SN - 2214-8604
ER -