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具有一定组织的工具钢和高速钢,在AC_1减10～15℃到AC_1的温度范围内,以(1.33～2.13)×10~(-3)秒~(-1)的变形速度单向拉伸时,呈现超塑性挤压时,工具钢和高速钢出现超塑性的温度范围与单向拉伸时相同。但在高于10.0～12.0千巴的流体静压力下,出现超塑性的合适速度可增大几个数量级,同时组织因素的影响减弱。在(?)474型100吨滚压机上,在(10~(-2)～10~(-3))秒~(-1)的变形速度范围内和上述温度条件下,匀速挤压,实现了工具钢和高速钢模具毛坯及带柄刀具毛坯的超塑性挤压。超塑性挤压具有高的生产率,材料利用率达0.85～0.95。在超塑性挤压时,变形抗力大大降低。挤压产品的组织均匀。机械性能和使用寿命比切削加工产品提高1.8倍。
The tool steel and high speed steel with certain structure are uniaxially stretched at a deformation rate of (1.33 ~ 2.13) × 10 ~ (-3) s ~ (-1) within a temperature range of AC_1 minus 10 ~ 15 ℃ to AC_1 , Superplastic extrusion presents a superplastic temperature range for tool steels and high-speed steels that is the same as for uniaxial stretching. At hydrostatic pressures higher than 10.0 to 12.0 kPa, however, the proper rate of superplasticity can increase by several orders of magnitude with the effect of the tissue factor diminished. In the (?) 474 type 100 ton roller press, under the temperature range of (10 ~ (-2) ~ 10 ~ (-3)) sec ~ (-1) To achieve the tool steel and high-speed steel mold blank and handle the rough tool superplastic extrusion. Superplastic extrusion with high productivity, material utilization rate of 0.85 ~ 0.95. In superplastic extrusion, deformation resistance is greatly reduced. Squeeze the product evenly. Mechanical properties and life expectancy 1.8 times higher than the cutting products.