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利用DIL805A热膨胀仪结合金相-硬度法,测得了22CrMoB钢的临界温度,绘制了该材料的过冷奥氏体连续冷却转变曲线(CCT曲线),研究了该材料的过冷奥氏体连续冷却过程中的相变规律,最后依据该材料的CCT曲线和现场数据设计了变形温度和变形后冷却速度,研究了22CrMoB钢变形及冷却后其带状组织和魏氏组织等缺陷组织的析出行为。结果表明,22CrMoB钢的A_(c1)为730℃,A_(c3)为840℃,临界冷却速度大约为50℃·s~(-1),淬透性相比22CrMo钢加入B元素前得到了提高。22CrMoB钢得到了理想的变形及冷却参数:变形温度控制在940~980℃左右,冷速控制在0.6~0.9℃·s~(-1);析出组织为晶粒细小均匀的铁素体和珠光体组织,无带状组织和魏氏组织。
The critical temperature of 22CrMoB steel was measured by DIL805A dilatometer combined with metallographic - hardness method. The CCT curve of supercooled austenite of this material was drawn. The effect of undercooled austenite continuous cooling In the end, the deformation temperature and the cooling rate after deformation were designed according to the CCT curve and the field data of the material. The precipitation behavior of 22CrMoB steel, such as banded and Widre organization, was studied after deformation and cooling. The results show that the critical cooling rate of 22CrMoB steel is 730 ℃, A_ (c3) is 840 ℃, and the critical cooling rate is about 50 ℃ · s ~ (-1). The hardenability of 22CrMoB steel is obtained before adding B element improve. 22CrMoB steel obtained the ideal deformation and cooling parameters: deformation temperature controlled at about 940 ~ 980 ℃, cooling rate controlled at 0.6 ~ 0.9 ℃ · s ~ (-1); precipitation of fine grain uniform ferrite and pearl Tissue, ribbon-like tissue and Wei’s tissue.