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本文系统地研究了OOCr_(14)Ni_6MoNb马氏体时效不锈钢在300℃、350℃、400℃长期时效直到5000小时的力学性能和结构的变化。发现合金在400℃时效1000小时后,强度升高、冲击韧性降低,合金明显脆化。用x-射线衍射测定了时效后的微观应变变化。微观应变与强度的变化并无直接的联系。用Mossbauer能谱测定了合金元素的重新分布。有理由认为,促使合金脆化是由于富铬等合金元素的偏聚区的形成。
In this paper, the mechanical properties and structural changes of OOCr_ (14) Ni_6MoNb martensitic stainless steel aged at 300 ℃, 350 ℃ and 400 ℃ for up to 5000 hours have been studied systematically. After aging at 400 ℃ for 1000 hours, the alloy showed higher strength, lower impact toughness and obvious embrittlement of the alloy. The microscopic strain changes after aging were measured by x-ray diffraction. There is no direct correlation between microscopic strain and the change of intensity. The Mossbauer spectrum was used to determine the redistribution of alloying elements. It is reasonable to assume that the embrittlement of the alloy is due to the formation of segregation zones of alloying elements such as chromium.