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利用超快速冷却技术对碳素钢中渗碳体的纳米析出行为和强化作用进行了研究.实验结果表明,在超快速冷却条件下,0.17%C和0.33%C钢的组织中形成了大量弥散的纳米级渗碳体析出,颗粒尺寸为10~100 nm,实现了在无微合金元素添加的条件下渗碳体的纳米级析出.随着超快速冷却终冷温度的降低,钢的屈服强度和抗拉强度都逐渐增加,当超快速冷却的终冷温度从890℃下降到600℃时,0.17%C和0.33%C钢的屈服强度提高超过了100 MPa.在超快速冷却之后采用形变热处理工艺,可以进一步增加钢的位错密度,促进渗碳体均匀形核,实现了纳米级渗碳体颗粒在整个组织中更加均匀弥散的分布,从而更好地实现均匀强化的效果.在超快速冷却和形变热处理工艺条件下,0.17%C钢的屈服强度提高到600 MPa以上.
The ultra-rapid cooling technique was used to study the nano-precipitation behavior and strengthening effect of cementite in carbon steel.The experimental results show that a large amount of dispersion is formed in the microstructure of 0.17% C and 0.33% C steel under ultra-rapid cooling Of nano-scale cementite precipitation, the particle size of 10 ~ 100 nm, in the absence of micro-alloying elements to achieve nano-scale cementite precipitation under the conditions of super-rapid cooling with the cooling temperature decreased, the steel yield strength And tensile strength both increased gradually and the yield strength of 0.17% C and 0.33% C steels increased by more than 100 MPa when the final quench temperature of ultra-fast cooling decreased from 890 ° C to 600 ° C. After ultra-rapid cooling, the deformation heat treatment Technology can further increase the dislocation density of steel to promote uniform nucleation of cementite to achieve a more uniform distribution of nano-scale cementite particles throughout the organization, so as to achieve better uniform strengthening effect.In the ultra-fast Cooling and deformation heat treatment process conditions, 0.17% C yield strength increased to 600 MPa above.