Observations about tempered martensite embrittlement
Observations about tempered martensite embrittlement
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DOI：
10.1111/j.1600-0692.2005.00701.x
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发表时间：
2005-02
期刊：
影响因子：
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通讯作者：
J. Pietikäinen
中科院分区：
文献类型：
--
作者：
J. Pietikäinen
本文用静态扭转、弯曲试验和示波冲击试验研究了AISI 4340钢回火马氏体的脆性。力学性能测试结束后，对试样进行扫描电镜观察。观察到，在夏比试验中，当断口在试样中扩展时，特别是在回火马氏体脆化区退火后，能量的使用较小。根据试验结果，提出了在脆化区断裂不是临界断裂，而是在dτ/dtgγ为负值的点断裂的观点。
An investigation on the embrittlement of tempered martensite has been carried out with AISI 4340 steel using the static torsion and bending tests together with the instrumented Charpy tests. After the mechanical tests, the specimens were studied by scanning electron microscope. It was observed that in Charpy tests the use of energy was minor when the fracture spread out in the test specimen especially after annealing at tempered martensite embrittlement region. Based on the test results the idea was presented that at the embrittlement region the fracture is not critical, instead the point where dτ/dtgγ becomes negative.