Abstract
The effects of grain boundary M 23C 6 precipitates on the low temperature (−196°C) tensile properties are systematically studied. For specimens aged at 650°C for 240 h and at 750°C for 100 h, the low temperature tensile strength, elongation and reduction in area are reduced severely and the specimens fail by brittle intergranular fracture. This is probably due to the dense grain boundary carbide and also to the grain boundary martensite in the chromium-depleted zone. The amounts of reduction in tensile strength, elongation and reduction of area increase with increasing grain size for specimens aged at 650°C for 240 h. The fracture strength is proportional to the inverse of the square root of grain size, and a critical stress intensity factor is determined.
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