锻压技术

22CrMoB钢过冷奥氏体相变规律及冷却工艺设计

英文标题：Under-cooled austenite phase transformation rules and design of cooling process for steel 22CrMoB

作者：陈涛陈亚迪

分类号：TG142.1

出版年,卷(期):页码：2017,42(10):189-194

摘要：

利用DIL 805A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Ac1为730 ℃，Ac3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。

By dilatometer DIL 805A with microstructure and hardness measurement, the critical temperatures of steel 22CrMoB was determined, and its continuous cooling transformation (CCT) curve of under-cooled austenite was obtained. Then, the transformation rules of continuous cooling process for undercooled austenite were studied. At last, the deformation temperature and cooling temperature after deformation were designed according to CCT curve and field data of the steel, and the precipitation behaviors of the banded microstructure and widmanstatten microstructure of steel 22CrMoB were studied after deformation and cooling. The results show that the Ac1 and Ac3 temperatures of steel 22CrMoB is 730 ℃ and 840 ℃ respectively, its critical cooling rate is recommended at 50 ℃·s-1 and the hardenability is increased comparing to steel 22CrMo before adding element B. Thus, its ideal deformation and cooling parameters are obtained with the deformation temperature of 940-980 ℃ and the cooling rate of 0.6-0.9 ℃·s-1. Furthermore, the ferrite and pearlite of fine and uniform grains are precipitated without the banded microstructure and widmanstatten microstructure.

基金项目：

河北省科技计划项目（15211031）；河北工业职业技术学院应用研发中心项目（2015YF01）

陈涛（1970-），男，硕士，副教授，E-mail：chtao8888@163.com

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