基于流体压力作用下的不锈钢棒单向拉伸断口形貌分析  

Fractography in the Uniaxial Tension Process of Stainless Steel Bars under the Fluid Pressure

作　　者：李峰[1] 张鑫龙[1] 

机构地区：[1]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150040

出　　处：《哈尔滨理工大学学报》2013年第2期16-20,共5页Journal of Harbin University of Science and Technology

基　　金：黑龙江省研究生创新科研项目( YJSCX2012-100HLJ)

摘　　要：为了研究流体压力作用下典型材料的成形规律及作用机理,采用塑性理论和实验相结合的方法分析了流体压力对不锈钢棒材成形性能、断口形貌的影响规律,研究结果表明:流体压力对不锈钢棒伸长率的影响显著,在低应变速率下其伸长率相比普通单拉时提高了24.2%,应变速率为0.01 s-1时则提高了39%;与普通单拉断口形貌相比,流体压力作用下断口中心韧窝区较大,但韧窝分布稀疏,细小韧窝均未长大,其断裂形式以剪切分离为主.In order to discover the deformation behavior and corresponding mechanism ol the typlcal matenat under fluid pressure, a combining method of plastic theory and process experiment which analyzed the stainless steel bars forming properties and fractography under the fluid pressure had been proposed. The study results indicate that under the fluid pressure, the elongation after facture of the stainless steel bars changes significantly. At the lower strain rate, the elongation under fluid pressure increases by 24. 2% compared with the conventional tensile deformation without fluid pressure, increasing by 39% when the strain rate is 0. 01s-t. Compared with the brittle fracture of the conventional tensile deformation, under the fluid pressure, the dimple area of the fracture central part is larger, but it is sparse, the tiny dimples are not growing up, and the form of its fracture is mainly to cut separation.

关 键 词：流体压力 不锈钢棒 单向拉伸 断口形貌 成形性能 

分 类 号：TG302[金属学及工艺—金属压力加工]