热处理工艺对新型无磁辊材料硬度及析出相的影响

EFFECT OF HEAT TREATMENT PROCESS ON THE HARDNESS AND PRECIPITATES OF NEW NON-MAGNETIC ROLLER MATERIAL

针对新型连铸用无磁辊材料成分,设计不同的热处理试验方案并测得其硬度,并采用SEM、TEM、图像统计分析等方法,观察并计算无磁辊材料经不同热处理后析出相的形貌及尺寸,从而建立新型无磁辊材料热处理工艺与硬度、析出相尺寸之间的关系。结果表明:660、710、760、810℃温度下,材料的硬度随着时效时间延长先上升,达到峰值后下降,其析出相γ’不断粗化;860℃下时效,材料硬度趋于平稳且较低。在760℃下时效12 h后,材料硬度最高达到321HBS,γ’相平均尺寸在30.4 nm,且弥散分布在基体上。

For the composition of new non-magnetic roller material,designing different testing programs of heat treatment to measure its hardness,and using SEM,TEM,image statistical analysis to observe and calculate the size of the precipitates after different heat treatments,thus to establish the relationship between the heat treatment,hardness and the size of the precipitates.The results showed that under the temperature of 660,710,760,810 ℃,the hardness rose initially and then declined with the aging time increasing and its γ＇-phase coarsening;Under 860 ℃,the hardness was inclined to stable and low;after 12 hours aging at 760 ℃,the hardness maximally achieved 321HBS,the average size of γ＇-phase was 30.4 nm,dispersing on the substrate.