On the temperature dependence of fracture toughness of deformed and recrystallized low-alloyed chromium

被引：0
|
作者：
Sameljuk, AV [1 ]
Vasilev, AD [1 ]
Firstov, SA [1 ]
机构：
[1] Frantsevich Inst Problem Mat Sci, UA-252680 Kiev, Ukraine
来源：
MODELING THE MECHANICAL RESPONSE OF STRUCTURAL MATERIALS | 1998年
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中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The temperature dependences of fracture toughness as well as sequences of fracture mechanisms changes of deformed and recrystallized chromium alloyed with 0,5% (w/w) La2O3 were studied in a wide temperature range. It was found, that the fracture toughness is nonmonotonously depended on temperature. As temperature is raised cleavage fracture toughness increases up to 500 degrees C for deformed state and up to 600 degrees C for recrystallized one. The dynamic deformation ageing is responsible for appearance of brittle intergranular fracture and decreasing the fracture toughness of recrystallized material at temperature above 600 degrees C. Sharp increasing of the dependence of deformed material above 500 degrees C is due to plane-strain to plane-stress transition. The decreasing fracture toughness of deformed material at higher temperature results from changing of fracture mechanisms from cleavage to pore coalescence.
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页码：249 / 254
页数：6
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