摘要
在Gleeble-3800热模拟试验机上对一种低碳CrNi3Si2MoV钢进行了热变形+Q&P和Q&P两种工艺处理,探讨热变形对Q&P钢微观组织和硬度的影响,用SEM和TEM进行微观组织表征,用X-Ray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,热变形+Q&P工艺处理的样品残奥量提高8.1%,抗拉强度降低60 MPa,断后伸长率提高2.4%,热变形导致晶粒细化同时引入大量位错,利于提高Q&P工艺钢未转变奥氏体的稳定性,从而提高残留奥氏体量。热变形+Q&P工艺处理样品中,由于大量碳扩散到残留奥氏体中,导致钢的强度略有降低,而残奥量及其稳定性较高,其TRIP效应更明显。
Q＆P （quenching and partitioning） process was carried out immediately after hot compressing about 30% at 750℃ on a low carbon CrNi3Si2MoV steel by using Gleeble-3800 hot simulation test machine. The effects of hot deformation on the microstructure and hardness of the steel were discussed. The microstructure and retained austenite fraction were studied by SEM, TEM and X-Ray respectively. The results indicate that the hot deformation＋Q＆P process steel shows the retained austenite volume fraction increases by 8.1% and tensile strength decreases 60 MPa, ductility increases by 2.4% compared with that of Q＆P process steel. Grain refinement and a large number of dislocations which are lead by hot deformation can cause residual austenite more stable. The strength is decreased because a large number of carbon diffusion into the residual austenite in hot deformation＋Q＆P process steel. The stability of retained austenite causes the TRIP effect more apparently.
出处
《热加工工艺》
CSCD
北大核心
2013年第10期188-190,168,共4页
Hot Working Technology
基金
青年科学基金资助项目(51101036)
国家973基金资助项目(2010CB630803)
关键词
Q&P
硬度
抗拉强度
马氏体
残留奥氏体
Q＆P steel
hardness
tensile strength
martensite
retained austenite
