高强度高弹性模量合金灰铸铁的研究试制
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摘要
随着气缸套机械性能要求的不断提高,以Cr、Ni、Mo及Cu为主要添加元素,制备了高强度高弹性模量的合金灰铸铁气缸套。本次试验通过添加不同含量Cr、Ni、Mo、Cu合金元素及不同温度下等温淬火热处理,制备高强度高弹性模量的合金灰铸铁。结果表明:在合金元素含量为Cr 0.15-0.35%,Ni 0.2-0.3%,Mo 0.2-0.3%,Cu 0.5-0.65%,经过880-910℃奥氏体化,350℃盐浴炉等温2h后,灰铸铁的机械性能达到最高,此时抗拉强度大于500MPa,弹性模量大于150GPa。石墨以A型为主,长度为4-6级,基体组织为贝氏体和少量残余奥氏体,可以作为气缸套使用材料的技术储备。
With the improvement of mechanical properties of cylinder liner, the alloy grey cast iron cylinder liner with high strength and high elastic modulus was prepared with Cr, Ni, Mo and Cu as main additives. Alloy gray cast iron with high strength and high modulus of elasticity was prepared by adding Cr, Ni, Mo, Cu alloy elements and isothermal quenching heat treatment at different temperatures. The results show that the mechanical properties of gray cast iron are the highest after austenitizing at 880-910℃ and isothermal treatment in350℃ salt bath furnace for 2 h, when alloying element content is Cr 0.15-0.35%,Ni 0.2-0.3%,Mo 0.2-0.3%,Cu 0.5-0.65%. The tensile strength of gray cast iron is greater than 500 MPa, and the modulus of elasticity is greater than 150 GPa. The graphite is mainly of type A and the size is 4-6. The matrix is bainite with a small amount of retained austenite, which can be used as the technical reserve of cylinder liner materials.
With the improvement of mechanical properties of cylinder liner, the alloy grey cast iron cylinder liner with high strength and high elastic modulus was prepared with Cr, Ni, Mo and Cu as main additives. Alloy gray cast iron with high strength and high modulus of elasticity was prepared by adding Cr, Ni, Mo, Cu alloy elements and isothermal quenching heat treatment at different temperatures. The results show that the mechanical properties of gray cast iron are the highest after austenitizing at 880-910℃ and isothermal treatment in350℃ salt bath furnace for 2 h, when alloying element content is Cr 0.15-0.35%,Ni 0.2-0.3%,Mo 0.2-0.3%,Cu 0.5-0.65%. The tensile strength of gray cast iron is greater than 500 MPa, and the modulus of elasticity is greater than 150 GPa. The graphite is mainly of type A and the size is 4-6. The matrix is bainite with a small amount of retained austenite, which can be used as the technical reserve of cylinder liner materials.
引文
[1]徐世钧.气缸套的发展[J].内燃机配件,1982(1):44-48,54.
[2]徐超,张红菊,秦小才.铸态贝氏体多元合金铸铁气缸套研发[J].内燃机配件,2012(09):9-11.
[3]张志武,刘永峰,秦小才,张亮亮.一种梯度功能材质缸套的研究[J].内燃机与配件,2015(04):36-38.
[4]曾欣.铝合金压铸用新型热作模具钢的制备及性能研究[J].铸造,2017(03):234-237.
[2]徐超,张红菊,秦小才.铸态贝氏体多元合金铸铁气缸套研发[J].内燃机配件,2012(09):9-11.
[3]张志武,刘永峰,秦小才,张亮亮.一种梯度功能材质缸套的研究[J].内燃机与配件,2015(04):36-38.
[4]曾欣.铝合金压铸用新型热作模具钢的制备及性能研究[J].铸造,2017(03):234-237.