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JING Hongyang, LI Shibo, XU Lianyong, ZHAO Lei. Experimental study on high temperature fracture toughness of P92 steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(2): 8-12. DOI: 10.12073/j.hjxb.2019400033
Citation: JING Hongyang, LI Shibo, XU Lianyong, ZHAO Lei. Experimental study on high temperature fracture toughness of P92 steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(2): 8-12. DOI: 10.12073/j.hjxb.2019400033

Experimental study on high temperature fracture toughness of P92 steel

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  • Received Date: October 23, 2017
  • In this paper, a new type of heat-resistant steel, P92 was used as the research object, and the fracture toughness at 630 °C high temperature was studied by using different kinds size of side-grooved and plain-sided of compact tension(CT) specimens. The resistance curves and the corresponding fracture toughness JQ of the specimens under different forms were obtained. Through the analysis of fracture morphology, the fracture toughness of P92 steel at high temperature is good, which is a typical ductile fracture mechanism. Based on the three-dimensional finite element calculation, the influence of the side-groove on the constraint of the specimen was characterized by constraint parameter Tz and Q, through which the effect of the constraint on the experimental results was discussed. Research shows that, side-groove can significantly increase the constraint level of the specimen, and the smaller the size of the specimen, the more obvious the effect of the side-groove, so the smaller the size of the specimen, the more obvious the difference between the J resistance curve; with the increase of load, plain-sided specimen's constraint change is more obvious, so side-groove structure will lead to different resistance curve; the change of the size or structure of specimens has a great influence on the resistance curve of the ductile material, but the effect on the fracture toughness value is small. After the side-grooved, the crack propagation is more uniform and the fracture toughness test process can be optimized.
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