作者：董海江, 刘秀成, 何存富, 吴斌
作者单位：北京工业大学材料与制造学部，北京 100124
关键词：微磁检测;屈服强度;抗拉强度;硬化层深度;多元线性回归
摘要：
研究利用微磁检测方法对高频感应淬火45钢的力学指标（屈服/抗拉强度、硬化层深度）进行无损定量检测。首先，利用商用3ma-ii型微磁检测仪器对淬硬杆件进行总计25项微磁参量测量，并通过拉伸和维氏硬度测试法分别测定试件的屈服强度、抗拉强度和硬化层深度；其次，利用皮尔逊相关系数统计法，分析筛选得到对力学指标敏感的微磁参量；最后，构建多元线性回归模型，利用微磁参量对3项力学指标进行定量预测。研究结果表明：微磁方法可以很好地对力学指标进行定量检测，模型对屈服强度、抗拉强度和硬化层深度预测结果的均方根误差分别为0.64 mpa、1.42 mpa和9 μm。研究方法与结论可为力学指标的微磁无损检测提供借鉴。
nondestructive testing of strength and case depth in high-frequency induction hardened 45 steel using micro-magnetic method
dong haijiang, liu xiucheng, he cunfu, wu bin
faculty of materials and manufacturing, beijing university of technology, beijing 100124, china
abstract: nondestructive and quantitative testing of yield/tensile strength and case depth of high-frequency induction hardened 45 steel were investigated based on micro-magnetic method. firstly, a total of 25 feature parameters were measured from samples of induction hardened rods using commercial 3ma-ii micro-magnetic analyzer. the yield/tensile strength, case depth of the specimens were measured by tensile tests and vickers hardness tester, respectively. secondly, pearson correlation analysis was performed to screen the micro-magnetic parameters that were sensitive to the investigated mechanical parameters. finally, multiple linear regression models were established to quantitatively predict the three mechanical parameters with the measured micro-magnetic parameters. the results show that micro-magnetic method demonstrated good performance in quantitative testing of mechanical parameters. the root-mean square errors of the models in predicting the yield strength, tensile strength and case depth were 0.64 mpa, 1.42 mpa and 9 μm, respectively. the proposed research method and obtained conclusion can provide a reference for the micro-magnetic nondestructive testing of mechanical parameters.
keywords: micro-magnetic testing;yield strength;tensile strength;case depth;multiple linear regression
2021, 47(6):6-12 收稿日期: 2020-11-08;收到修改稿日期: 2021-01-06
基金项目: 国家重点研发计划项目（2018yff01012300）；国家自然科学基金项目（11527801，11872081）
作者简介: 董海江(1986-),男,河北张家口市人,博士研究生,研究方向为微磁无损检测及其自动化
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