Stainless steel material with shape memory function and preparation method thereof

[0024] Further, the preparation method of the stainless steel traction bow with shape memory function comprises the following steps:

[0025] Step 1. After smelting and casting the metal raw materials to obtain steel ingots, clean up the dross on the surface of the steel ingots, and then hot forge the steel ingots. The forging temperature is controlled at 1000°C, and the heating rate during the initial heating is controlled at 80°C / h. When the steel ingots are heated to 600°C , increase the heating rate to 200°C / h until the steel ingot reaches 1000°C, press it into a plate in one hot forging, then cool the plate to 780-820°C, hot forge the plate again to form a steel bar of the required specification, and the steel bar with Furnace is cooled to room temperature, obtains billet steel bar;

[0026] Step 2. Perform stress-relief annealing on the original billet steel bar, and then process the original billet steel bar into the shape of the drawing bow by machining to obtain the

[0030] Table 1 Examples 1-6 of stainless steel materials (mass percentage: %)

[0031]

[0032] The main performance of the stainless steel material that above-mentioned embodiment makes is as shown in table 2:

[0033] Table 2 Main properties of the finished alloy materials of Examples 1-6 (at room temperature 25°C)

[0034]

[0035] As can be obtained from Table 2, the tensile strength of the stainless steel material of the present invention is very low, only 383-485 N / mm 2 , the yield strength does not exceed 375 N / mm 2 , the toughness reaches 8.5 J / cm 2 , the shape recovery rate reaches 97.4%, and the shape recovery rate increases with the increase of yttrium content, which shows that the addition of yttrium can improve the shape recovery rate of Fe-Mn-Si memory alloy. The stainless steel material of the invention solves the problems of excessive yield strength and low bending performance of traditional stainless steel materials, overcomes the defect that the t