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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of boron and carbon on the fracture toughness of IN 718 superalloy at room temperature and 650 °C
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Effect of boron and carbon on the fracture toughness of IN 718 superalloy at room temperature and 650 °C

机译：硼和碳对室温和650°C的IN 718高温合金断裂韧性的影响

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摘要

The effect of B and C microadditions on the fracture toughness of IN 718 superalloy was investigated at room temperature (RT) and at 650 °C. At RT, the fracture toughness was observed to increase with increasing B and C concentrations. C had a relatively weak effect on the fracture toughness at 650 °C, but the influence of B was significant. At RT the highest fracture toughness value was obtained for the alloy with 29 ppm B and 225 ppm C at RT, and at 650 °C the alloy with 60 ppm B and 40 ppm C had the highest fracture toughness. An increase in the concentration of B to 100 ppm, however, resulted in a reduction in the fracture toughness at 650 °C. Fractographic observations showed that the formation and coalescence of microvoids was the predominant fracture mechanism at RT. In contrast, at 650 °C, the fracture surface exhibited intergranular cracking in the alloy with lower B concentrations and transgranular cracking coupled with fine dimples in the alloy with higher B concentrations. It is suggested that B impedes intergranular cracking by increasing the cohesion of grain boundaries and improving the grain boundary stabilization. The RT increase in the fracture toughness of the material caused by the addition of C is attributed to the formation of intergranular and intragranular carbides that increased the resistance to the plastic deformation.
机译：在室温（RT）和650°C下研究了B和C微量添加对IN 718高温合金断裂韧性的影响。在室温下，观察到断裂韧性随B和C浓度的增加而增加。 C对650°C的断裂韧性影响相对较小，但B的影响很大。在室温下，具有29 ppm B和225 ppm C的合金在室温下获得最高的断裂韧性值，在650°C下，具有60 ppm B和40 ppm C的合金具有最高的断裂韧性。但是，将B的浓度增加至100ppm会导致650℃的断裂韧性降低。断口观察表明，微孔的形成和聚结是室温下的主要断裂机理。相反，在650°C时，B含量较低的合金中，断裂面表现出晶间裂纹； B含量较高的合金中，沿晶裂纹伴随有细小凹坑。认为B通过增加晶界的内聚力和改善晶界的稳定性来阻止晶界开裂。由于添加C导致材料断裂韧性的RT升高归因于晶间和晶内碳化物的形成，从而增加了对塑性变形的抵抗力。

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