表面变质层硬度的压痕表征方法  

Indentation Characterization Method for Hardness of Surface-modified Layer

作　　者：徐广涛[1] 孙博[1] 陈海宽 郑雪峰 XU Guangtao;SUN Bo;CHEN Haikuan;ZHENG Xuefeng(School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学机械与动力工程学院,河南郑州450001

出　　处：《郑州大学学报（工学版）》2021年第4期58-62,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(11702252);河南省高等学校青年骨干教师培养计划(2019GGJS005)。

摘　　要：为了解决关键构件经表层改性后产生的表面变质层硬度参数难以测量的问题,提出了一种表面变质层硬度的压痕表征方法。根据硬度与深度的关系,使用连续压痕加载表征表面变质层硬度。只要压入深度超过表面变质层深度就能提取整个表面变质层的硬度信息。通过ANSYS有限元仿真建立表面变质层-基体梯度模型,施加连续压痕,验证发现,表征出的硬度和真实硬度很接近。对18CrNiMo7-6合金钢进行渗碳热处理,并用该方法表征了热处理后的18CrNiMo7-6合金钢的表面变质层硬度。将测量结果与沿表面变质层侧面表征的显微硬度结果进行比较,发现2种方法得到的表面变质层硬度最大误差不超过6%。该方法能用来表征材料表面变质层的真实硬度场,具有一定的工程应用价值。In order to measure the hardness parameters of the surface-modified layer( SML) of key components after surface modification,in this paper a method to characterize the hardness of the SML was proposed.According to the relationship between hardness and depth,continuous indentation loading was used to characterize the hardness of the SML. The SML-substrate model was established through ANSYS finite element simulation,and continuous indentation was applied to verify that the calculation hardness was very close to the real hardness. Carburizing heat treatment was performed on 18 CrNiMo7-6 alloy steel to produce a SML on the surface,and the hardness of the SML of the heat-treated 18 CrNiMo7-6 alloy steel was characterized by this method. Compared with the micro hardness results characterized along the side of the SML,it was found that the hardness error of the SML obtained by the two methods was no more than 6%. This method could be used to characterize the real hardness of the SML on the surface of the material,and had certain engineering application value.

关 键 词：压痕硬度 表面变质层 热处理 18CrNiMo7-6合金钢 

分 类 号：TU528.1[建筑科学—建筑技术科学]