作　　者： ; ;

机构地区： 华南理工大学机械与汽车工程学院

出　　处： 《材料研究与应用》 2013年第4期229-234,共6页

摘　　要： 对铬钒HRB400钢筋的强化机理进行了研究,结果表明,VCN析出物有显著的沉淀强化作用,形变诱导析出VCN粒子通过抑制奥氏体的再结晶细化晶粒;20MnSiVCr钢中的铬与碳的结合降低了碳的扩散速度,而铬的加入又使共析相变点左移,这是20MnSiVCr钢中珠光体含量明显增加的主要原因,20MnSiVCr钢主要通过VCN的沉淀强化和珠光体强化提高强度. The strengthening mechanism of HRIM00 rebar chromium and vanadium bearing is researched. The experimental results show that vanadium carbides and nitrides （VCN） precipitation have obvious effect on hardening. Austenite grain refinement can be achieved by deformation which induced VCN precipitation and inhibited austenite recrystallization. Combination of chromium and carbon in 20MnSiVCr steel decreases the diffusion of carbon, at the same time, chromium addition pushes the eutectoid transformation temperature to left in a phase diagram of iron-carbon. That is the main reason for volume fraction of pearlite increasing obviously. The strength of 20MnSiVCr is enhanced by precipitation hardening of VCN particles and pearlite strengthening.

关 键 词： 钢筋 微合金化 沉淀强化 晶粒细化 珠光体

领　　域： [金属学及工艺] [金属学及工艺]