脉冲放电止裂后裂尖处纳米尺度下的力学性能测试  

Mechanical Properties Testing of Materials around Crack Tip with Nano-meter Scale after Crack Arresting by Pulse Current Discharge

作　　者：郑丽娟[1] 乔利杰[2] 付宇明[1] 王平[1] 白象忠[1] 

机构地区：[1]燕山大学机械工程学院,秦皇岛066004 [2]北京科技大学材料工程学院,北京100038

出　　处：《实验力学》2003年第3期393-397,共5页Journal of Experimental Mechanics

基　　金：国家自然科学基金资助项目(批准号:50275128);河北自然科学基金资助项目(批准号:599255)

摘　　要：应用扫描探针显微镜SPM(ScanningProbeMicroscopy),对经过脉冲放电止裂后的40Cr模具钢裂尖处的组织进行了纳米尺度下的力学性能测试.测试结果表明:脉冲放电不仅使裂纹尖端钝化,同时使围绕裂尖处组织的细观硬度和细观杨氏弹性模量得到了提高,与宏观观测和分析规律相符.纳米尺度下微观力学性能测试结果为脉冲放电裂纹止裂技术的工程应用提供了微观尺度下的证据.Used Scanning Probe Microscopy, the mechanical properties of materials around crack tip are tested with nano meter scale after crack prevention by pulse current discharge. The 40Cr die steel plates are selected as sample. The testing results show that: the passivation of crack tip is not only obtained, but also the microcosmic hardness and modulus of materials around crack tip are improved. The results of experiments correspond to the results of macroscopical analysis. The experiments provided evidence in microcosmic scale for the crack arresting techniques used in practices.

关 键 词：脉冲放电止裂 裂纹尖端 纳米尺度 力学性能 测试 扫描探针显微镜 

分 类 号：TB383[一般工业技术—材料科学与工程] TB302.3