Effect of Heat Treatment Temperature on Microstructure and Properties of 0Cr21Al6 Hot Rolled Sheet

Abstract

In order to investigate the microstructure uniformity and plasticity of hot-rolled 0Cr21A16 alloy sheet and im prove its high temperature and cold working characteristics， heat treatment tests and microstructure properties analysis were carried out at different temperatures. The microstructure and mechanical properties of 0Cr21Al6 alloy sheet before and after heat treatment were studied by optical microscopy， X-ray diffraction （XRD）， Gleeble high temperature thermal tensile test， scanning electron microscopy （SEM） and nanoindentation. The results show that the microstructure unifor mity of 0Cr21Al6 alloy sheet can be improved by heat treatment， and the average grain size is about 42 μm after holding at 960 ℃ for 6 min 40 s， and the overall grain size is relatively uniform and fine compared with at 940、980、1 000、1 020 ℃ heat treatment， the hardness and plasticity are the best combination， and the fracture toughness KIC is the best after 960 ℃ heat treatment. With the best comprehensive performance， it can effectively avoid the brittle fracture of materials in the production process. In addition， Gleeble test shows that the heat treatment temperature over 1 000 ℃ is no longer suitable for hot processing.

Keywords

• fecral alloy；0cr21al6 steel； hot rolled sheet； heat treatment； microstructure； mechanical properties