5CrMnMo热锻模淬火开裂原因分析.pdfVIP

28 9 机 械 工 程 材 料 Vol. 28 No. 9 2004 9 M aterials for Mechanical En ineerin Sep. 2004 5CrMnMo 1, 2 3 , ( 1. 石家庄铁道学院材料科学与工程系, 河北石家庄050043; 2. 燕山大学材料科学与工程学院, 河北秦皇岛066004; 3. 江阴职业技术学院, 江苏江阴2 14433) : 对出 开裂的5CrM nMo 大型热锻模进行了金相硬度断口分析结果表明: 淬火加 热温度过高, 加热时间过长, 形成了粗大的马氏体组织; 淬火冷却时终冷温度过低, 导致过高的淬 火应力使锻模表面出 淬火开裂 象针对此问题采取相应措施后避免了锻模的淬火开裂 : 热锻模; 5CrMnMo; 淬火; 裂纹 : T G162. 4 1; T G315. 2 : A : 2004) Failure Analysis of the Quenchcracking of 5CrMnMo Hot Forging Die 1,2 FU Hua , WU Songqian ( 1. Shijiazhuan Railw ay Institute, Shijiazhuan 050043, China; 2. Yanshan University , Qinhuan dao 066004, China; 3. Jian y in Polytechnic Colle e, Jian yin 214433, China) Abstract: The quenchcrackin of 5CrMnMo alloy steel was studied by metallo raph analysis and SEM . The results show that the hi h quench temperature and lon hold time promoted formation of lar e Martensite microstructure inducin micro quencncrackin of the steel; the low final coolin temperature durin quenchin induced a hi h quench stress and quenchcrackin . T o resolve this problem, the heatreatment process has been chan ed to prevent the die from quenchcrackin . Key words: hot for in die; 5CrMnMo; quenchin ; crackin RX311512 , 1 , 15CrM nM o , , , [ 1- 3] , , , , , 5CrMnMo , 60 , , , , 50min 2 , 5CrM nMo ( ) , : 0. 5% ~ 0.