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在许多研究工作中,以及根据机械制造广的资料,表明BT20、BT25、BT18y和其它近α-合金的不同半制品在600～800℃空冷退火以后,发现在保持基体金属或焊接接头的塑性时韧性明显下降。研究了在500～900℃范围内退火温度(空冷)对近α-合金BT20(直径12毫米棒和厚度为40毫米板)和(α+β)一合金BT_6(直径12毫米棒)的机械性能的影响。合金成分见表1。带缺口和裂纹的试样单向拉伸和冲击弯曲的机械性能试验结果见图1。可以看出,在550～700℃退火温度范围内,BT20合金的冲击韧性a_T发生明显的下降(约
In many studies and based on extensive machine manufacturing data, it has been shown that different semi-products of BT20, BT25, BT18y and other near-alpha alloys, after air-cooling at 600 to 800 ° C, have found that while maintaining the ductility of the matrix metal or welded joint Toughness decreased significantly. The effects of annealing temperature (air cooling) on the mechanical properties of near-α-alloy BT20 (12 mm diameter and 40 mm thick plates) and (α + β) alloy BT_6 (12 mm diameter rods) Impact. Alloy composition shown in Table 1. The mechanical properties of uniaxial tensile and impact bending specimens with notches and cracks are shown in Figure 1. It can be seen that in the annealing temperature range of 550 ~ 700 ℃, the impact toughness of BT20 alloy a_T significantly decreased (about