Ductile-Brittle Transition and Embrittlement Mechanism of 13Cr11Ni2W2MoV Martensitic Heat-resistant Stainless Steel
SONG Jie1, CHANG Yingke2, WU Ruide2, LI Lin2, ZHANG Chengyu1,*
1 School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China 2 Shaanxi Applied Physics and Chemistry Research Institute, Xi'an 710061, China
Abstract: 13Cr11Ni2W2MoV martensitic heat-strength stainless steel can be used to produce the components of spaceflight igniter, whose working temperature is as low as -196 ℃, so it is rather important to investigate the low-temperature impact toughness of the steel. Therefore, Charpy impact properties of 13Cr11Ni2W2MoV steel were measured in the temperature range of -150 ℃ and 100 ℃. The microstructure and fracture morphology were observed by optical microscope(OM),scanning electron microscope(SEM) and transmission electron microscope(TEM). The ductile-brittle transition temperature (DBTT) was obtained according to the impact energy and the rate of brittle fracture. The results show that the DBTT of 13Cr11Ni2W2MoV is -35.5 ℃. The impact energy of 13Cr11Ni2W2MoV steel decreases from 180 J to 30 J when the temperature decreases from 100 ℃ to -150 ℃. The fracture mode of radiation zones is quasi-cleavage, and there are tearing edges and clea-vage facts on the fracture surface. The height of the cleavage steps and the width of the tearing edge are reduced with the decrease of temperature. The fracture mode of fiber zones and shear lip zones is ductile fracture. Dimples are visible on the fracture surfaces. The number and depth of the dimples decrease with the decrease of temperature. The energy for the crack initiation and stable crack propagation are significantly reduced with the decrease of temperature, and the cracks are easy to grow, so the ductile-brittle transition occurs. The ductile-brittle transition might be caused by difficulties of the dislocation generation and slip at low temperatures.
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2022, Vol. 36 
