Effect of strain rate on phase transformation behavior in Cr-Mo steel during friction stir welding
- Miura T. ,
- Ueji R. ,
- Fujii H. ,
- et al
- Miura T. ,
- Ueji R. ,
- Fujii H. ,
- Komine H. ,
- Sugiyama S. and
- Yanagimoto J.
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Microstructural observations and mechanical tests were undertaken to investigate the phase transformation behaviour of low alloy Cr-Mo steel (0.2%C, 0.61%Mn, 1.07%Cr, 0.16%Mo) sheets (thickness 1.6 mm) during friction stir welding. Stir-in-plate type welding was conducted at a rotational speed of 400 rpm and a welding speed of 100 or 400 mm/min under conditions in which specimens were reheated above the A3 temperature with a subsequent high cooling rate. Microstructure observations in the stir zone by optical microscopy, SEM and electron backscattering diffraction were used to examine elongated ferrite grains with retained austenite. Compression tests were conducted at various strain rates using an ultrahigh-speed compression testing machine. The influence of plastic deformation at high strain rate on microstructure formation is discussed.
10th International Symposium, 20-22 May 2014, Session 5B: Steel II, Paper 02
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