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
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2 N，L-II层的平均硬度为2 594.13 HV；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1 N，L-III层的平均硬度为2 334.88 HV；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。
压痕法
表面强化层
层状结构
显微硬度
断裂韧性
Ti-Nb alloy
indentation method
surface strengthening layer
lamellar structure
microhardness
fracture toughness
Abstract
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 2 N, and the average hardness of the L-II layer was 2 594. 13 HV. In the vertical cross section direction, the edge effect caused by the thickness of the strengthening layer was gradually significant. The effective test load was 1 N, and the average hardness of the L-III layer was 2 334. 88 HV. L-II layer had larger particle size, and its hardness and fracture toughness were better than L-III layer.
中图分类号 TB31 TG115.5 DOI 10.11973/lhjy-wl202302006
所属栏目 试验技术与方法
基金项目 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）
收稿日期 2022/8/24
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备注朱建雷(1987-),男,博士,主要研究方向为金属基复合材料的制备与表征,zhujl9160@163.com
引用该论文: ZHU Jianlei,XIANG Yuchun,CHEN Xiangfen. Evaluation of microhardness and fracture toughness of (TiNb)C strengthening layer on Ti-Nb alloy surface by indentation method[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2023, 59(2): 20～24
朱建雷,向玉春,陈祥芬. 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[J]. 理化检验－物理分册, 2023, 59(2): 20～24
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【5】韩雪莹,刘新利,吴壮志,等.含难熔金属涂层的研究进展[J].材料导报,2020,34(13):146-154.
【6】孙伟,洪晟,吴玉萍.超音速火焰喷涂制备WC-Cr3C2-Ni涂层工艺参数的优化[J].理化检验(物理分册),2019,55(10):698-702,707.
【7】房双强,陈茂涛,曲江江,等.渗氮技术与渗氮钢应用综述[J].材料导报,2014,28(增刊1):392-395.
【8】冉玲,孙承才,康玉桃,等.渗碳和碳氮共渗淬火硬化层深度的测定精度影响因素[J].理化检验(物理分册),2022,58(7):5-9.
【9】崔鹏杰,钟黎声,白海强,等.铸造在层状双金属复合材料中的应用[J].热加工工艺,2020,49(19):1-6.
【10】LAWN B R,EVANS A G,MARSHALL D B.Elastic/plastic indentation damage in ceramics:the median/radial crack system[J].Journal of the American Ceramic Society,1980,63(9/10):574-581.
【11】龚江宏.陶瓷材料断裂力学[M].北京:清华大学出版社,2001.
【12】朱建雷.钛铌合金表面(TiNb)C强化层的形成机制与性能研究[D].西安:西安理工大学,2020.
【13】QU S,HUANG Y,NIX W D,et al.Indenter tip radius effect on the Nix-Gao relation in micro-and nanoindentation hardness experiments[J].Journal of Materials Research,2004,19(11):3423-3434.
【14】BULL S J.Analysis methods and size effects in the indentation fracture toughness assessment of very thin oxide coatings on glass[J].Comptes Rendus Mécanique,2011,339(7/8):518-531.
【15】蔡小龙.扩散控制的反应制备碳化钨硬质层形成机理及性能研究[D].西安:西安理工大学,2019.
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【18】NIIHARA K,MORENA R,HASSELMAN D P H.Evaluation of KC of brittle solids by the indentation method with low crack-to-indent ratios[J].Journal of Materials Science Letters,1982,1(1):13-16.
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