Effect of pre-rolling path on mechanical properties of rolled ZK60 alloys
(1. School of Materials and Energy, Southwest University, Chongqing 400715, China;
2. School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;
3. School of Mechanical Technology, Wuxi Institute of Technology, Wuxi 214121, China;
4. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China)
2. School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;
3. School of Mechanical Technology, Wuxi Institute of Technology, Wuxi 214121, China;
4. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China)
Abstract: Pre-cold rolling with low reductions (<3%) was used to improve the mechanical properties of rolled ZK60 plates. The effects of rolling path on mechanical properties were investigated in detail. Both pre-cold rolling along the transverse direction (TD) and pre-cold rolling along the normal direction (ND) can increase the yield strength. However, pre-cold rolling along the TD is more effective than pre-cold rolling along the ND in improving the comprehensive mechanical properties. After pre-cold rolling to 3% reduction, the sample rolled along the TD and the sample rolled along the ND have similar tensile yield strength (~270 MPa). However, the former has a higher compressive yield strength, lower yield asymmetry and larger toughness than the latter. Moreover, pre-cold rolling can also enhance precipitation hardening effect. However, aging treatment cannot further improve the yield strength of pre-cold rolled samples. Finally, the related mechanism is discussed.
Key words: ZK60 alloy; pre-cold rolling; dislocation; twin; aging; mechanical properties