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采用热扭转及热顶锻试验,分别在试验温度750～1200及900～1200℃,热扭转应变速率为1.1～4.6×10~(-1)s~(-1)下,对铸态和轧态组织的W-Mo高速钢的热塑性进行了试验研究。试验结果表明:W6Mo5Cr4V2与W9Mo3Cr4V的塑性变形曲线具有完全相同的走向:分别存在着高温塑性区(1000～1100℃),低温高塑性区(780～870℃)以及低温脆性温度(880℃)。其低温高塑性不可逆,当加热温度超过880℃,再将温度降到低温高塑性区内,其塑性大大下降。W6Mo5Cr4V2Al的塑性曲线与其不同。加入Al可改善热塑性,降低变形抗力。W及Mo增加高速钢的变形抗力(特别在高温时)。采用非连续热扭转变形可大大提高高速钢的热塑性,消除低温脆性。
Hot twisting and hot upsetting tests were carried out on the as - cast and rolled at the test temperatures of 750-1200 and 900-1200 ℃ respectively under the thermal torsional strain rate of 1.1-4.6 × 10 -1 s -1. The state of the organization of W-Mo high-speed steel thermoplastic test conducted. The experimental results show that the plastic deformation curves of W6Mo5Cr4V2 and W9Mo3Cr4V have the same trend: high temperature plastic zone (1000 ~ 1100 ℃), low temperature high plastic zone (780 ~ 870 ℃) and low temperature brittle temperature (880 ℃) respectively. The low temperature high plasticity irreversible, when the heating temperature exceeds 880 ℃, then the temperature dropped to low temperature plastic zone, the plastic greatly decreased. W6Mo5Cr4V2Al plastic curve and its different. Adding Al can improve the thermoplastic, reduce the deformation resistance. W and Mo increase high-speed steel deformation resistance (especially at high temperatures). The use of non-continuous thermal deformation can be greatly improved high-speed steel thermoplastic, to eliminate low temperature brittleness.