压痕法评价钛铌合金表面(TiNb)C强化层显微硬度及断裂韧性  

Evaluation of microhardness and fracture toughness of(TiNb)C strengthening layer on Ti-Nb alloy surface by indentation method

作　　者：朱建雷 向玉春 陈祥芬 ZHU Jianlei;XIANG Yuchun;CHEN Xiangfen(Xianyang Vocational Technical College,Xi’an 712000,China;School of Materials Science and Engineering,Xi’an University of Science and Technology,Xi’an 710048,China)

机构地区：[1]咸阳职业技术学院,西安712000 [2]西安理工大学材料科学与工程学院,西安710048

出　　处：《理化检验（物理分册）》2023年第2期20-24,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：陕西省教育厅科研计划项目(21JK0972);咸阳职业技术学院科研基金资助项目(2021BK02);陕西省自然科学基础研究计划项目(2022JQ416)。

摘　　要：采用压痕法研究了钛铌合金表面(TiNb)C强化层内层状组织对显微硬度的影响,在有效测试载荷的作用下,测量大量压痕的尺寸及裂纹长度,再利用经验公式,对断裂韧性进行计算。结果表明:随着测试载荷的增加,在垂直表面方向,“硬壳-软底”结构导致的基底效应逐渐显著,有效测试载荷为2N,L-Ⅱ层的平均硬度为2594.13HV;在垂直横截面方向,强化层厚度导致的边缘效应逐渐显著,有效测试载荷为1N,L-Ⅲ层的平均硬度为2334.88HV;L-Ⅱ层具有较大的颗粒尺寸,其硬度和断裂韧性均优于L-Ⅲ层。The effect of lamellar structure on the microhardness of(TiNb)C strengthening layer on the surface of Ti-Nb alloy was studied by indentation method.The size of a large number of indentations and the length of cracks were measured under effective test load.The fracture toughness was calculated by empirical formulas.The results show that with the increase of the test load,the substrate effect caused by the‘hard shell-soft bottom’structure was gradually significant in the vertical surface direction.The effective test load was 2N,and the average hardness of the L-Ⅱ layerwas2594.13HV.Intheverticalcrosssection direction,the edge effect caused by the thickness of the strengthening layer was gradually significant.The effective test load was 1N,and the average hardness of the L-Ⅲ layer was 2334.88 HV.L-Ⅱ layer had larger particle size,and its hardness and fracture toughness were better than L-Ⅲ layer.

关 键 词：钛铌合金 压痕法 表面强化层 层状结构 显微硬度 断裂韧性 

分 类 号：TB31[一般工业技术—材料科学与工程] TG115.5[金属学及工艺—物理冶金]