摘要
用Gleeble-3800试验机对一种低碳CrNi3Si2MoV钢开展了热压缩30%后立即进行淬火配分(Q&P)工艺处理的试验,探讨变形温度对淬火配分钢微观组织和硬度的影响,用SEM和TEM进行微观组织表征,用XRD测量残留奥氏体体积分数。结果表明,与Q&P工艺处理的样品相比,变形后再进行Q&P工艺处理的样品存在残奥量和维氏硬度同时升高的现象,随变形温度的降低,钢的硬度逐渐升高,残奥量先增大后减小,热变形导致钢的Ms温度升高,变形温度为750℃的样品获得最大量的残留奥氏体,达到17.2%,热变形引入的位错促进C的配分,同时提高钢的强度。
Quenching and partitioning （Q＆P） process was carried out immediately after hot compression deformation of 30% on a low carbon CrNi3Si2MoV steel by using Gleeble-3800 hot simulation test machine. The effect of deformation temperature on microstructure and hardness of the steel was discussed, microstructure and retained austenite fraction of the steel were measured by means of SEM, TEM and XRD. The results show that both the retained austenite fraction and hardness increase after process of hot deformation followed by Q＆P process compared with that of the sample treated by normal Q＆P process. With the decreasing of deformation temperature, hardness of the steel increases and the retained austenite fraction increases firstly and then decreases. The hot deformation causes the increasing of Ms temperature, the maximum retained austenite fraction of 17.22% is obtained when hot deformation at 750 ℃. In addition, the dislocations introduced by hot deformation not only accelerate the partitioning of carbon, but improve the strength of the steel.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第5期97-102,共6页
Transactions of Materials and Heat Treatment
基金
青年科学基金项目(51101036)
国家"973"项目(2010CB630803)
关键词
淬火配分(Q&P)
热变形
硬度
抗拉强度
马氏体
残留奥氏体
Quenching and partitioning （Q＆P）
hot deformation
martensite
retained austenite
hardness
tensile strength
