Mechanical properties of sheeting made of D16 alloys when heated

Conclusions

• 1. The poorest strength characteristics are shown by sheets of alloy D16 containing the lower limits of alloying elements.

• 2. Sheets quenched after annealing and not straightened after quenching also exhibit poor ultimate strength and yield points at room and elevated temperatures (brief tension).

• 3. Sheets quenched after cold rolling and after annealing and then stretcher leveled show higher, almost identical strength characteristics.

• 4. Variation in the degree of deformation during straightening within 1 to 3% does not have any great effect on the strength characteristics of a material. But even slight deformation (about 1%) affects these characteristics, particularly after prolonged soaking.

• 5. At 200° the chief factor influencing the increase in stress-rupture strength is straightening after quenching. The straightening has a particularly favorable effect on specimens with a coarse micrograin.

• 6. At 250 and 300° straightening affects the stressrupture strength to a lesser extent than the grain size.