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在一种含钨、钼的40Ni-14Cr-Fe基高温合金中,正常热处理后就出现μ相,开始析出于晶界。微量(～0.1％)μ相就对合金塑性,尤其会使冲击韧性值成倍下降,是合金长时期使用中脆化的主要因素。 晶界微量μ相引起的脆化倾向与晶界上的μ相密集程度成正比关系,可通过控制成分及细化晶粒来降低μ相的密集程度,从而减弱晶界μ相引起的脆化作用。 沿晶μ相所造成的室温冲击沿晶断裂形式,其断裂特征不是沿整个μ相介面形成孔洞,而只是沿部分μ相介面形成裂纹。
In a 40Ni-14Cr-Fe-based superalloy containing tungsten and molybdenum, the μ phase appears after normal heat treatment and begins to precipitate at the grain boundaries. Trace (~ 0.1%) μ phase on the alloy plasticity, in particular, will make the impact toughness value doubled, the alloy is the main factor in the long-term use of embrittlement. The tendency of embrittlement caused by the micro-phase of the grain boundary is directly proportional to the concentration of the μ-phase on the grain boundary. The density of the μ-phase can be reduced by controlling the composition and grain refinement so as to weaken the embrittlement caused by the grain boundary μ phase effect. The intergranular impact caused by the intergranular μ phase is along the intergranular fracture mode. The fracture feature of the intergranular fracture is not along the entire μ phase interface, but only along the μ-phase interface.