For ZG1Cr18Ni9Ti and casting Ni-base alloy Hastelloy B, the effecting factors and critical cutting speed of thermoplastic shear instability and the character of thermoplastic shear band in cutting process are discussed.

• 主要讨论了ZG1Cr18Ni9Ti和镍基铸造合金Hastelloy B在切削过程中热塑剪切失稳的成因、临界切削速度以及热塑剪切带的特点。