摘要
为了研究含硼的M23C6相的析出行为对CB2钢力学性能的影响,对含硼的CB2钢分别进行了690℃、710℃、730℃、750℃、770℃和790℃的回火处理。通过OM、SEM和TEM等观察含硼的M23C6相在690—790℃回火温度中的析出行为,借助Thermo-Calc阐明回火温度对M23C6相析出行为的影响机制,结合硬度和室温拉伸等性能测试研究CB2钢中M23C6相析出行为对其性能的影响规律,确定最佳回火温度。研究发现:随着回火温度的升高,CB2钢中马氏体板条逐渐变宽,板条马氏体转变为多边形铁素体;M23C6相的平均尺寸从132.19nm增加到197.62nm,当回火温度超过750℃时,M23C6相的增大速度明显加快;CB2钢的强度和硬度降低,伸长率和断面收缩率增加;当回火温度为730℃时CB2钢的综合性能较好。
In order to study the influence of the precipitation behavior of boron-stabilized M23C6 phase on the mechanical properties, the CB2 steel containing boron was tempered at 690 ℃, 710 ℃, 730 ℃, 750 ℃, 770 ℃ and 790 ℃, respectively. The precipitation behavior of boron-stabilized M23C6 phase at tempering temperature from 690 ℃ to 790 ℃ was observed by OM, SEM and TEM. The effect of tempering temperature on the precipitation behavior of M23C6 phase was clarified by means of Thermo-Calc. Combined with hardness and room temperature stretching perfor-mance test, the influence law of precipitation behavior of M23C6 phase in CB2 steel on performance was studied to determine the best tempering temperature. The results show that as the tempering temperature increases, martensite in CB2 steel gradually broadens and martensite lath changes to ferrite. The average size of M23C6 phase increased from 132.19 nm to 197.62 nm. When the tempering temperature exceeded 750 ℃, the increase of M23C6 accelerated obviously. The strength and hardness of CB2 steel decreased, while the elongation and reduction of area increased. When the tempering temperature was 730 ℃, CB2 steel had better overall performance.
作者
江旭
马煜林
刘越
JIANG Xu;MA Yulin;LIU Yue(School of Materials Science and Engineering, Northeastern University, Shenyang 110819)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2019年第12期2062-2066,共5页
Materials Reports
基金
国家自然科学基金重点项目(51334004)
辽宁省科技重大专项(201404001)~~
关键词
金属材料
M23C6相
回火温度
马氏体耐热钢
metallic materials
M23C6 phase
tempering temperature
martensite heat resistant steel
