Microstructure evolution and mechanical properties of linear friction welded S31042 heat-resistant steel

doi:10.1016/j.jmst.2017.11.031

Abstract

Abstract:

S31042 heat-resistant steel was joined by linear friction welding (LFW) in this study. The microstructure and the mechanical properties of the LFWed joint were investigated by optical microscopy, scanning electronic microscopy, transmission electron microscopy, hardness test and tensile test. A defect-free joint was achieved by using LFW under reasonable welding parameters. The dynamic recrystallization of austenitic grains and the dispersed precipitation of NbCrN particles resulting from the high stress and high temperature in welding, would lead to a improvement of mechanical property of the welded joint. With increasing the distance from the weld zone to the parent metal, the austenitic grain size gradually increases from?～1 μm to ～150 μm, and the microhardness decreases from 301 HV to 225 HV. The tensile strength (about 731 MPa) of the welded joint is comparable to that of the S31042 in the solution-treated state.

Key words: Austenitic steel, Welding, Microstructure, Mechanical property, Precipitation

Yanmo Li, Yongchang Liu, Chenxi Liu, Chong Li, Zongqing Ma, Yuan Huang, Zumin Wang, Wenya Li. Microstructure evolution and mechanical properties of linear friction welded S31042 heat-resistant steel[J]. J. Mater. Sci. Technol., 2018, 34(4): 653-659.

Figures/Tables 9

Fig. 1. Microstructure of the parent S31042 heat-resistant steel (a) OM and (b) SEM images.

Fig. 2. Appearance of the welded joint.

Fig. 3. Micrographs of the linear friction welded S31042: (a) full view by OM, (b)-(e) high-magnification SEM of region A-D in Fig. 3(a), respectively.

Fig. 4. (a), (b) SEM and (c) TEM, (d) the lattice-scale HRTEM image corresponding to (c) of the weld zon.

Fig. 5. Microstructure of the thermo-mechanically affected zone: (a) TEM and (b) the lattice-scale HRTEM image of the circled region in (a).

Fig. 6. Microhardness distribution from the weld zone to the parent metal.

Fig. 7. (a) Full view of the fractured tensile specimen, (b)-(e) high-magnification SEM images of regions A-D in Fig. 7(a), respectively; (f), (g) EDS spectra of NbCrN particle.

Fig. 8. Micrograph of the weld zone after tensile test.

Fig. 9. SEM fractographs of the specimen: (a) longitudinal section, (b) over view of fracture face, (c) and (d) high-magnification images of site A and B in Fig. 9(b), respectively.

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