P92钢塑性变形行为  

Plastic Deformation Behavior of P92 Steel

作　　者：高巍[1] 刘江南[1] 王正品[1] 石崇哲[1] 

机构地区：[1]西安工业大学材料与化工学院,西安710032

出　　处：《西安工业大学学报》2008年第4期356-359,共4页Journal of Xi’an Technological University

摘　　要：为了给P92钢的安全使用以及塑性变形加工提供理论依据,对P92钢的塑性变形行为进行了研究.采用静拉伸试验方法研究了P92钢的室温塑性变形行为.结果表明,P92钢均匀塑性变形和局部集中塑性变形过程都分为三个阶段,塑性变形过程中发生了剧烈的形变强化.在局部集中塑性变形阶段,随着变形量的增大,板条马氏体顺拉伸方向伸长变形,同时马氏体板条束的位向顺拉伸方向转动.随颈缩率ψ的增大,马氏体板条相对伸长量ΔL/L0的增长速率加快,逐渐趋于平稳,马氏体板条对拉伸轴夹角θ的减小速率减慢.Plastic deformation behavior has important engineering significance for safe service and strain processing of P92 steel. To provide the theoretical basis of safe service and plastic deformation forming, plastic deformation behavior of P92 steel is studied, by means of static tensile test. The results showed that both uniform plastic deformation and non-uniform plastic deformation consist of three stages, its strain hardening exponents are 0. 17, 0. 26, 0. 20, 0. 22, 0. 40, 0. 82. In the non-uniform plastic deformation,martensite laths expand along the elongation direction of deformation, while the martensite laths rotate round the elongation direction with the increase of deformation. With necking rate ψ increases, the relative elongation of martensite lath △L/L0 gradually becomes stable, the decrease rate of angle θ of martensite lath to tensile axis is slowed.

关 键 词：P92钢 均匀塑性变形 局部集中塑性变形 形变硬化指数 

分 类 号：TG113.25[金属学及工艺—物理冶金]