摘要
对Q345B热轧板进行了退火处理，研究其在不同退火条件下的组织及力学性能演变规律。结果表明，退火温度在550℃左右时，铁素体发生再结晶，同时珠光体中开始分解出保留珠光体分布规律与特征的渗碳体组织；温度在600℃左右时完成再结晶。随着退火温度的升高，Q345B钢的抗拉强度和屈服强度逐渐降低，在500-640℃温度区间内，强度降低速度较快，伸长率则随着退火温度的升高逐渐增大。继续增大退火温度时，力学性能变化较小。
Annealing treatment was carried on Q345B hot rolled steel sheet to investigate its microstructure and properties under different annealing conditions. The results show that re-crystallization of ferrite occurs at about 550 ℃, at the same time cementite decomposes from pearlite and retain the distribution feature of pearlite. And the re-crystallization finish at about 600 ℃. With the increase of temperature, the tensile strength and yield strength of Q345B decrease gradually and rapidly decrease at a temperature range from 500℃ to 640 ℃. While the elongation increases gradually with the increase of temperatue. And the mechanical properties almost do not change with the further increase of temperature.
出处
《铸造技术》
CAS
北大核心
2013年第7期821-823,共3页
Foundry Technology
基金
广西工学院博士基金项目(院科博1003)
广西工学院自然科学基金项目(1166103)
关键词
退火
Q345B
热轧板
显微组织
力学性能
annealing
Q345B
hot-rolled sheet
microstructure
mechanical properties
