Study on Fracture Toughness of Mn-Mo-Ni High Strength Steel for Nuclear Power Engineering under Different Heat Treatment Conditions
The microstructure and fracture toughness of 30 mm and 90 mm thick high-strength Mn-Mo-Ni steel plate for nuclear power engineering under different heat treatment conditions are studied by high magnification mi-croscope and scanning electron microscope.According to ASTM E208-95a(R2000)standard,the non-plastic transi-tion temperature(NDTT)of 30 mm thickness steel plate at surface and 90 mm thickness steel plate at 1/4 thickness position under different heat treatment conditions are measured respectively,and the causes for the difference in NDT temperature of test steel plate are compared and analyzed.The results show that the NDT temperatures of the steel plate produced by quenching and tempering process are significantly reduced compared with those produced by normalizing and tempering process.The NDT temperature position of the steel plate produced by different quenching and tempera-ting processes are also different at 1/4 of the thickness position.
Mn-Mo-Ni high-strength steelHeat treatmentNDT temperature
NETL
NSTL
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