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采用Gleeble-1500D热/力模拟实验机进行拉伸实验,测试20CrMnTi钢650—1050℃温度范围柱状晶区内的应力-应变曲线、高温强度、硬化系数及热塑性,研究了铸坯各高温力学性能参量与取样位置的关系。结果表明,随着距铸坯表面距离的增加,铸坯抗拉强度降低,低温(650℃)下的硬化系数明显增大;750℃时,1#、2#和3#试样的断面收缩率均达到最低,约为60%;取样位置由1#试样变为3#试样时,铸坯裂纹敏感区宽度保持在150℃左右,温度区间整体向低温区移动约17℃。以1#试样为参考,矫直过程中的铸坯表面温度应控制在825℃以上。
The tensile test was carried out on a Gleeble-1500D hot / force simulator to test the stress-strain curves, the high temperature strength, the coefficient of hardening and the thermoplastic properties of 20CrMnTi steel in the columnar region at 650-1050 ℃. Relationship between parameters and sampling position. The results show that with the increase of the distance from the slab surface, the tensile strength of the slab decreases, and the coefficient of hardening at low temperature (650 ℃) increases obviously. The cross-sectional area of # 1, # 2 and # 3 specimens shrinks at 750 ℃ When the sampling position changed from 1 # specimen to 3 # specimen, the width of sensitive zone of slab cracks remained at about 150 ℃, and the whole temperature range shifted to about 17 ℃ to the low temperature zone. 1 # sample as a reference, the straightening process of slab surface temperature should be controlled at 825 ℃ above.