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| EFFECT OF MOLYBDENUM ON DELAYED FRACTURE BEHAVIOR OF HIGH STRENGTH STEEL |
| HUI Weijun; DONG Han; WENG Yuqing; SHI Jie; ZHANG Xiaozhong |
| Institute of Structural Materials; Central Iron & Steel Research Institute; Beijing 100081 |
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Cite this article:
HUI Weijun; DONG Han; WENG Yuqing; SHI Jie; ZHANG Xiaozhong. EFFECT OF MOLYBDENUM ON DELAYED FRACTURE BEHAVIOR OF HIGH STRENGTH STEEL. Acta Metall Sin, 2004, 40(12): 1274-1280 .
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Abstract Four heats of V and Nb microalloyed 40Cr steel containing 0 to 1.54% Mo
were used to study the effect of Mo on delayed fracture resistance. The
results of both notched tensile sustained load test and stress corrosion
cracking test show that the delayed fracture resistance increases with
increasing Mo content. Maximum delayed fracture resistance is obtained
at a Mo concentration of about 1.15%. The result of EDS
(energy dispersive spectroscopy) analysis shows
that Mo tends to segregate in the grain boundary in a scale of no more
than a few nanometers. EELS (electron energy loss spectra) measurement
indicates that the segregation
of Mo in grain boundary tends to increase the strength of grain boundary.
The pronounced effect of Mo in raising the tempering resistance and the
ability to strengthen prior austenite grain boundary are the main reasons
for the beneficial effect of Mo on delayed fracture resistance. Hydrogen
trapping effect caused by fine Mo2C precipitation could also improve
the delayed fracture resistance. It is also confirmed that the tested
steels could have a much higher delayed fracture resistance when the
secondary hardening carbides of V and Mo are in the condition of slight
over-raging.
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Received: 28 December 2003
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