Effects of heat treatment and testing temperature on fracture mechanics behavior of low-Si CA-15 stainless steel |
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Authors: | Cheng-Hsun Hsu Shen-Chih Lee Hwei-Yuan Teng |
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Affiliation: | (1) the Department of Materials Engineering, Tatung University, Taiwan 10451, Republic of China |
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Abstract: | This research studied the effects of heat treatment and testing temperature on fracture mechanics behavior of Si-modified
CA-15 martensitic stainless steel (MSS), which is similar to AISI 403 grade stainless steel, which has been widely used in
wall and blanket structures and in the pipe of nuclear power plant reactors, turbine blades, and nozzles. The results indicated
that fracture toughness of low-Si CA-15 MSS is better than that of AISI 403. The specimens of the low-Si CA-15 MSS after austenitization
at 1010 °C and then tempering at 300 °C have higher plane-strain fracture toughness (K
IC
) values for both 25 °C and −150 °C testing temperatures. However, the specimens tested at 150 °C cannot satisfy the plane-strain
fracture toughness criteria. The fatigue crack growth rate is the slowest after austenitization at 1010 °C for 2 hours and
tempering at 400 °C. Observing the crack propagation paths using a metallographic test, it was found that the cracking paths
preferred orientation and branched along ferrite phase, owing to martensite-phase strengthening and grain-boundary-carbide
retarding after 300 °C to 400 °C tempering. Also, transmission electron microscopy (TEM), scanning electron microscopy (SEM),
and X-ray diffraction analysis were performed to correlate the properties attained to the microstructural observation. |
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Keywords: | |
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