大尺寸NiCrMoV钢锻件的预备热处理工艺  

Pre-heat treatment process for large size NiCrMoV steel forgings

作　　者：李光 秦红付 李洁 苏文博 李梁瑜 金明 Li Guang;Qin Hongfu;Li Jie;Su Wenbo;Li Liangyu;Jin Ming(Luoyang CITIC HIC Casting&Forging Co.,Ltd.,Luoyang Henan 471039,China;State Key Laboratory of Intelligent Mining Heavy Equipment,Luoyang Henan 471039,China)

机构地区：[1]洛阳中重铸锻有限责任公司,河南洛阳471039 [2]智能矿山重型装备全国重点实验室,河南洛阳471039

出　　处：《金属热处理》2025年第2期235-240,共6页Heat Treatment of Metals

基　　金：河南省重大科技专项(221100230200)。

摘　　要：针对高淬透性NiCrMoV钢锻件锻后晶粒粗大和组织遗传性问题,采用小试样工艺试验的方法,分析了正火前预处理、多次高温正火处理、两相区高温侧正火和退火等热处理工艺方案对切断组织遗传和晶粒细化效果。依据转子芯轴锻件尺寸形状特点,制定了最优的预备热处理工艺方案,提出了奥氏体化加热温度、时间和冷却过程控制措施。结果表明,经最佳预备热处理后,生产的大尺寸锻件本体取样检测实际晶粒度6.5级,锻件超声波探伤满足Φ2 mm起始灵敏度要求。In response to the problem of coarse grain and structural inheritance of high hardenability NiCrMoV steel forgings after forging,a process experiment using small-sized specimens was used to analyze the effect of heat treatment schemes such as pre-treatment before normalizing,multiple high-temperature normalizing treatments,two-phase region high-temperature side normalizing and annealing for cutting off the structural inheritance and for grain refinement.According to the size and shape characteristics of the rotor core shaft forgings,the optimal pre-heat treatment process scheme was developed,and control measures for austenitizing heating temperature and time and cooling process were proposed.The results show that after the optimal pre-heat treatment,the actual grain size of the actual produced large size forging body is sampled and tested as grade 6.5,and the ultrasonic testing of the forging meets the Φ2 mm initial sensitivity requirement.

关 键 词：NiCrMoV钢 转子芯轴锻件 晶粒粗大 组织遗传性 预备热处理 

分 类 号：TG142.1[一般工业技术—材料科学与工程]