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本文评价了发展一种抗回火软化与经济地使用合金元素相结合的钢种的途径。为了获得所希望的回火性能,它是利用非碳化物形成元素来促进二次硬化反应,并且利用钒添加物来减少 Mo_2C 的粗化速率。本文研究了五种合金。这些合金是具有一种基本成分的二次硬化钢。基本成分的钢通过加入2%(重量)Si 以及复合加入1%(重量)Si 和1%(重量)Al 来改性。对这两种改性的钢再分别添加0.4%(重量)V 来制得另两种合金。研究发现,无钒的两种改性钢是以相同的显著程度促进二次硬化,而回火温度高于600℃时就迅速软化。但是,加钒的合金在650℃后硬度仍超过 HRC50.同样,Si 添加物对抗回火软化显得必不可少,硅也有集于奥氏体化后初生碳化物的保持;但是当硅超过一定量时,钢在高温回火后就会引起脆性晶间断裂。
This article assesses avenues for developing a type of steel that is resistant to tempering and softens the combination of alloying elements economically. In order to obtain the desired tempering properties, it utilizes non-carbide forming elements to promote the secondary hardening reaction and utilizes the vanadium additive to reduce the coarsening rate of Mo 2 C. This article studies five alloys. These alloys are secondary hardened steels with a basic composition. The base steel is modified by the addition of 2% by weight of Si and the complex addition of 1% by weight of Si and 1% by weight of Al. To the two modified steel were added 0.4% by weight of V to prepare the other two alloys. The study found that vanadium-free two modified steel to promote the same degree of significant secondary hardening, and the tempering temperature is higher than 600 ℃ to soften quickly. However, the vanadium-added alloy still has hardness above HRC50 after 650 ° C. Likewise, Si addition is essential to temper softening and silicon is also concentrated in austenitizing primary carbides; however, when silicon exceeds a certain amount When the steel tempering at high temperatures will cause brittle intergranular fracture.