摘要
对机械液压杆用22MnB5合金进行淬火-碳分配热处理(Q&P),研究了淬火终点温度和分配时间对合金力学性能和组织的影响。结果表明,随着分配时间延长,钢的抗拉强度逐渐降低,而断后伸长率呈先增加而后降低的趋势;在相同的分配时间下,淬火终点温度250℃时钢的抗拉强度小于淬火终点温度为200℃的,而断后伸长率高于后者;奥氏体化温度为910℃、淬火终点温度为250℃、分配温度为420℃、分配时间为60 s时,22MnB5钢的组织由铁素体、马氏体和少量残余奥氏体组成,残余奥氏体体积分数为11.6%。
The 22 MnB5 cold rolled steel for mechanical hydraulic rod was quenching-partitioning-heat-treated（Q P）, the effect of quenching endpoint temperature and time distribution on mechanical properties and microstructure was studied.The result shows that, with the increase of allotted time, the tensile strength of the steel decreases, while the elongation increases and then decreases. The tensile strength after quenching at 250 ℃ is lower than that at 200 ℃, while the elongation is higher at 250 ℃. When austenitic temperature is 910 ℃, quenching temperature is 250 ℃, distribution temperature is 420 ℃, and distribution time is 60 s, the steel consists of ferrite, martensite and a few of austenite, the volume fraction of retained austenite is 11.6%.
出处
《铸造技术》
CAS
北大核心
2017年第1期77-80,共4页
Foundry Technology
关键词
22MnB5钢
淬火温度
分配时间
力学性能
显微组织
22MnB5 steel
quenching temperature
distribution time
mechanical properties
microstructure
