蓝脆

拉伸加工中蓝脆与氢脆的产生及预防

Occurring Reason and Guarding Against Blue Brittleness and Hydrogen Brittleness During Drawing Manufacture

除此，还发现隐藏在蓝脆区的氢诱发裂纹。

Besides , the hydrogen induced cracking hidden at the blue brittleness area had been also discovered .

当温度低于或高于蓝脆温度时，材料具有循环软化、疲劳强度较低、循环蠕变速率较大的特点，循环蠕变对疲劳损伤起着加速的作用，断口具有延性断裂特征，循环蠕变孔洞较多；

When temperature is beyond blue brittle temperature , material exhibits cyclic softening , higher velocities of cyclic creep and ductile fracture appearance with many dimples and cavities of cyclic creep .

结论蓝巩膜、骨脆、进行性耳聋为遗传性成骨不全的特征性表现，尤其蓝巩膜为本病首现及易显体征，为诊断必备条件。

Conclusion The authors suggested that the triad of blue sclera , osteopsathyrosis and progressive deafness is the characteristic manifestations of the disease , especially blue sclera , which may be regarded as an initial and suggestible physical sign , and an essential criterion for diagnosis .