The brittleness of high-manganese steel under low temperature is discussed. A method of Iow-temperature cutting with liquid nitrogen freezing of the workpiece has been developed.
论述了高锰钢的低温脆性，建立了用液氮冷冻工件的低温切削方法。
Conclusion: the typical animal subsiding model of avascular necrosis of the femoral head can be established with blood vessel destroy and liquid nitrogen freezing.
结论：液氮冷冻并血管破坏可建立典型的犬股骨头缺血性坏死塌陷模型。
Conclusion: the typical animal subsiding model of avascular necrosis of the femoral head can be established with blood vessel destroy and liquid nitrogen freezing.
结论：液氮冷冻并血管破坏可建立典型的犬股骨头缺血性坏死塌陷模型。
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