本文较详细地研究了一种铁镍铬基合金长期时效过程中力学性能变化与组织结构的关系。合金的缺口敏感性与薄膜状TiC沿晶界析出有着密切的关系,随着时效温度的提高和时效时间的延长,晶界薄膜状TiC逐渐变为块状,因而缺口敏感得以消除。由于σ相数量很少,并呈块状分布,因此它能提高高温拉伸塑性及持久延伸率,对消除缺口敏感性也起到一定有利作用,但使室温拉伸塑性及室温冲击韧性下降,其不良影响比TiC及硼化物要小。
A study was made of the correlation between the mechanical properties and the microstructure variation of an Fe-Ni-Cr base superalloy on prolonged heat exposure. It was found that the notch sensitivity of the alloy is closely related to TiC film precipitated along grain boundaries. With raising temperature and prolonging time of aging treatment, the TiC films coarsen gradually into block so that the notch sensitivity vanished from the alloy. Because of the minute block-shaped σ-phase is distributed along the grain boundaries, the high temperature tensile elongation and the rupture toughness of the alloy as well as its notch sensitivity ilimination could be improved. However, its room temperature tensile elongation and impact ductility are reduced, yet no great harm was influenced upon them as compared with the same contents of TiC and boride.
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