工程科学学报，第40卷，第9期：1108-1114,2018年9月 Chinese Journal of Engineering,Vol.40,No.9:1108-1114,September 2018 DOI:10.13374/j.issn2095-9389.2018.09.012;http://journals.ustb.edu.cn GCr15轴承钢表面渗硼层生长动力学与机械性能 宗晓明”，蒋文明四，樊自田”，高飞2》 1)华中科技大学材料成形与模具技术国家重点实验室，武汉4300742)洛阳轴承研究所有限公司，洛阳471039 ☒通信作者，E-mail:jwenming(@163.com 摘要对GC15轴承钢表面渗硼层的生长动力学与机械性能进行了研究.采用固体渗硼的方法，在1123、1173、1223和 1323K温度条件下，分别保温处理2、4、6和8，进行渗硼层制备.采用光学显微镜、扫描电镜、X射线衍射仪、维氏硬度计等对 制备的渗硼层进行组织观察与性能分析，并通过试验数据对渗硼层的生长动力学特性进行了研究.研究结果表明：试样表面 获得了均匀致密的渗硼层，渗硼层的相成分主要是FB和F©2B:渗硼层的厚度随处理温度与保温时间的增加而增厚，变化范 围为33.4~318.5μm;渗硼层的表面硬度随处理温度及保温时间的增加而增大，主要是由于随着渗硼层厚度的增加，高硬度 FeB相的含量上升，低硬度Fe,B相的含量下降，表面硬度HV。,变化范围为1630~1950，与基体组织相比，提高了5-6倍：渗 层截面硬度测试结果表明，渗层与基体之间有较宽的硬度梯度过渡：通过Arrhenius公式，对渗硼层的生长动力学方程进行了 推导，可知B元素在CC15轴承钢中的扩散激活能为188.595kJ·ml,对推导的动力学方程进行了试验验证，结果表明最大 误差仅4.93%，可有效的实现对渗层厚度的预测. 关键词GC15轴承钢：渗硼：微观组织：机械性能：生长动力学 分类号TG156.8 Kinetics and mechanical properties of borided GCr15 bearing steel ZONG Xiao-ming",JIANG Wen-ming),FAN Zi-tian),GAO Fei 1)State Key Lab of Materials Processing and Die Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China 2)Luoyang Bearing Research Institute Co.,Ltd.,Luoyang 471039,China Corresponding author,E-mail:jwenming@163.com ABSTRACT The kinetics and mechanical properties of borided GCr15 bearing steel was investigated.The boriding treatment was carried out in a solid medium at 1123,1173,1223,and 1323 K for 2,4,6,and 8 h.The microstructures and mechanical properties of the boride layer were characterized by optical microscopy,scanning electron microscopy,X-ray diffraction,and Vickers hardness tester,and the growth kinetics characteristics were also studied based on experimental data.The results indicate that the boride layer has a smooth and compact morphology,and the presence of FeB and FeB on the steel substrate is confirmed by X-ray diffraction analy- sis.The thickness and hardness of the boride layer increase with treatment time and temperature,where the thickness ranges from 33.4 to 318.5 um.The increased hardness is mainly because of the increase in the highly hard FeB phase content.The content of Fe2 B phase,which has a low hardness,decreases with an increase of layer thickness.The hardness of the boride layer HV ranges within 1630-1950,and it is increased by 5 to 6 times compared with the matrix.The hardness test results of the boride layer cross section in- dicate that there is a wide transition of hardness gradient between the boride layer and the matrix.The kinetic equation based on the ex- perimental data and Arrhenius equation was investigated,the active energy of B element in the GCrl5 bearing steel is 188.595 kJ. mol-,and the derived kinetic equation is verified by experiments.The results indicate that the maximum error between the theoretical derivation and experimental derivation is 4.93%.Therefore,the derived kinetic equation can effectively predict the thickness of the boride layer on GCr15 bearing steel. 收稿日期：2017-10-08 基金项目：湖北省自然科学基金资助项目(2017CB488)工程科学学报，第 40 卷，第 9 期: 1108--1114，2018 年 9 月 Chinese Journal of Engineering，Vol． 40，No． 9: 1108--1114，September 2018 DOI: 10． 13374 /j． issn2095--9389． 2018． 09． 012; http: / /journals． ustb． edu． cn GCr15 轴承钢表面渗硼层生长动力学与机械性能 宗晓明1) ，蒋文明1) ，樊自田1) ，高 飞2) 1) 华中科技大学材料成形与模具技术国家重点实验室，武汉 430074 2) 洛阳轴承研究所有限公司，洛阳 471039 通信作者，E-mail: jwenming@ 163． com 摘 要 对 GCr15 轴承钢表面渗硼层的生长动力学与机械性能进行了研究． 采用固体渗硼的方法，在 1123、1173、1223 和 1323 K 温度条件下，分别保温处理 2、4、6 和 8 h，进行渗硼层制备． 采用光学显微镜、扫描电镜、X 射线衍射仪、维氏硬度计等对 制备的渗硼层进行组织观察与性能分析，并通过试验数据对渗硼层的生长动力学特性进行了研究． 研究结果表明: 试样表面 获得了均匀致密的渗硼层，渗硼层的相成分主要是 FeB 和 Fe2B; 渗硼层的厚度随处理温度与保温时间的增加而增厚，变化范 围为 33. 4 ～ 318. 5 μm; 渗硼层的表面硬度随处理温度及保温时间的增加而增大，主要是由于随着渗硼层厚度的增加，高硬度 FeB 相的含量上升，低硬度 Fe2B 相的含量下降，表面硬度 HV0. 1变化范围为 1630 ～ 1950，与基体组织相比，提高了 5 ～ 6 倍; 渗 层截面硬度测试结果表明，渗层与基体之间有较宽的硬度梯度过渡; 通过 Arrhenius 公式，对渗硼层的生长动力学方程进行了 推导，可知 B 元素在 GCr15 轴承钢中的扩散激活能为 188. 595 kJ·mol － 1，对推导的动力学方程进行了试验验证，结果表明最大 误差仅 4. 93% ，可有效的实现对渗层厚度的预测． 关键词 GCr15 轴承钢; 渗硼; 微观组织; 机械性能; 生长动力学 分类号 TG156. 8 收稿日期: 2017--10--08 基金项目: 湖北省自然科学基金资助项目( 2017CFB488) Kinetics and mechanical properties of borided GCr15 bearing steel ZONG Xiao-ming1) ，JIANG Wen-ming1)  ，FAN Zi-tian1) ，GAO Fei2) 1) State Key Lab of Materials Processing and Die ＆ Mould Technology，Huazhong University of Science and Technology，Wuhan 430074，China 2) Luoyang Bearing Ｒesearch Institute Co． ，Ltd． ，Luoyang 471039，China Corresponding author，E-mail: jwenming@ 163． com ABSTＲACT The kinetics and mechanical properties of borided GCr15 bearing steel was investigated． The boriding treatment was carried out in a solid medium at 1123，1173，1223，and 1323 K for 2，4，6，and 8 h． The microstructures and mechanical properties of the boride layer were characterized by optical microscopy，scanning electron microscopy，X-ray diffraction，and Vickers hardness tester，and the growth kinetics characteristics were also studied based on experimental data． The results indicate that the boride layer has a smooth and compact morphology，and the presence of FeB and Fe2B on the steel substrate is confirmed by X-ray diffraction analy￾sis． The thickness and hardness of the boride layer increase with treatment time and temperature，where the thickness ranges from 33. 4 to 318. 5 μm． The increased hardness is mainly because of the increase in the highly hard FeB phase content． The content of Fe2 B phase，which has a low hardness，decreases with an increase of layer thickness． The hardness of the boride layer HV0. 1 ranges within 1630--1950，and it is increased by 5 to 6 times compared with the matrix． The hardness test results of the boride layer cross section in￾dicate that there is a wide transition of hardness gradient between the boride layer and the matrix． The kinetic equation based on the ex￾perimental data and Arrhenius equation was investigated，the active energy of B element in the GCr15 bearing steel is 188. 595 kJ· mol － 1，and the derived kinetic equation is verified by experiments． The results indicate that the maximum error between the theoretical derivation and experimental derivation is 4. 93% ． Therefore，the derived kinetic equation can effectively predict the thickness of the boride layer on GCr15 bearing steel．