论文部分内容阅读
通过金相、扫描及系列冲击等试验方法研究了洁净度对38CrMoAl钢韧脆转变的影响。结果表明,低洁净度电炉钢与高洁净度双真空钢的韧脆转变温度都是-60℃。但是,在整个连续冲击试验温度范围内,DV钢的冲击韧性均高于EF钢。在连续冲击的上平台区,前者比后者高25 J左右,随着温度下降两者的差距随之降低,在上下平台之间区域内,前者比后者高5~10 J,随着温度继续下降进入到下平台区域,两者差距越来越小,直至差距为零。低的S、P元素含量,较少的MnS、AlN夹杂物是洁净度较高的DV钢韧性较好的主要原因。
The effect of cleanliness on the ductile-brittle transformation of 38CrMoAl steel was studied by means of metallographic examination, scanning and series of impact tests. The results show that the ductile-brittle transition temperature of the low-cleanliness electric furnace steel and the high-purity double-vacuum steel is -60 ℃. However, the impact toughness of DV steels is higher than that of EF steels throughout the continuous impact test temperature range. In the area of continuous impact on the upper platform, the former is 25 J higher than the latter. As the temperature decreases, the difference between the two decreases. In the area between the upper and lower platforms, the former is 5 to 10 J higher than the latter. As the temperature Continue to decline into the next platform area, the gap between the two smaller and smaller, until the gap is zero. Low S, P content, less MnS, AlN inclusions are the main reasons for the better toughness of DV steels.