Impact of Hard Turning Process on Surface Hardness and Microstructure of 18CrNiMo7-6 Steel

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Impact of Hard Turning Process on Surface Hardness and Microstructure of 18CrNiMo7-6 Steel

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[1]ZHANG Yinxia,LIU Xiuwu,YUAN Shaoshuai,et al.Impact of Hard Turning Process on Surface Hardness and Microstructure of 18CrNiMo7-6 Steel[J].Journal of Zhengzhou University (Engineering Science),2022,43(05):59-64.[doi:10.13705/j.issn.1671-6833.2022.05.004]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 43卷 Number of periods: 2022 05 Page number: 59-64 Column: Public date: 2022-08-22

Title:: Impact of Hard Turning Process on Surface Hardness and Microstructure of 18CrNiMo7-6 Steel

Author(s):: ZHANG Yinxia; LIU Xiuwu; YUAN Shaoshuai; GAO Wei; LIU Zhihua; School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China

Keywords:: 18CrNiMo7-6 steel ; hard turning; process parameters; work hardening; metallographic structure

CLC:: TG519. 1

DOI:: 10.13705/j.issn.1671-6833.2022.05.004

Abstract:: In order to explore the impact of hard turning process parameters of 18CrNiMo7-6 steel on work hardening and metallographic structure, PCBN tool was used to hard turning of the arc section of the 18CrNiMo7-6 steel funnel-shaped fatigue sample. The spindle speed n and the turning back ap and feed rate vf were carried out a as single factor experimental study. The surface hardness, work hardening depth of influence and microstructure of the samples under different process conditions were characterized by a microhardness tester and super depth of field 3D microscopy system. The research results showed that hard turning introduced a certain amount of work hardening to the arc segment of the funnel-shaped fatigue specimen, the depth of the hardened layer was 120～200 μm, and the degree of work hardening was 4.31%～8.27%. In the experiment conditions, with the increase of n, the degree of hardening of the sample first increased and then decreased, and the depth of the hardened layer did not change much; with the increase of ap, the depth of the hardened layer and the degree of hardening of the sample increased gradually; vf increased the degree of work hardening of the sample first and then decreased, and there was no obvious rule for the depth of the hardened layer; with the increase of the radial depth, the metallographic structure of the sample changed, and the hardness gradually decreased, and turning parameters had little effect on the metallographic structure of the surface of the sample; when n, ap and vf were 1 200 r/min, 0.15 mm and 50 mm/min, respectively, the surface of the sample softens, and the high-carbon martensite is transformed into a lower hardness tempered troostite. The finding of this study costed extra light on the formulation of hard turning process for 18CrNiMo7-6 hardened steel.

References:: [1] 袁熙, 李舜酩. 疲劳寿命预测方法的研究现状与发展[ J] . 航空制造技术, 2005, 48(12) : 80-84.
YUAN X, LI S M. Research status and development of forecast method of fatigue life [ J ] . Aeronautical manufacturing technology, 2005, 48(12) : 80-84.
[2] BOUZID W, TSOUMAREV O, SAÏ K. An investigation of surface roughness of burnished AISI 1042 steel [ J] . The international journal of advanced manufacturing technology, 2004, 24(1 / 2) : 120-125.
[3] 周永鑫. 切削加工表面塑性变形对试件疲劳寿命的影响研究[D] . 淄博: 山东理工大学, 2020.
ZHOU Y X. Research on the influence of surface plastic deformation of machining on fatigue life of specimens [ D ] . Zibo: Shandong University of Technology, 2020.
[4] 李伯民, 赵波. 现代磨削技术[ M] . 北京: 机械工业出版社, 2003.
LI B M, ZHAO B. Modern grinding technology[ M] . Beijing: China Machine Press, 2003.
[5] 岳彩旭, 刘献礼, 姬生园, 等. 硬态切削技术[ J] . 航空制造技术, 2008, 51(18) : 26-29.
YUE C X, LIU X L, JI S Y, et al. Hard cutting technology [ J ] . Aeronautical manufacturing technology, 2008, 51(18) : 26-29.
[6] KARPUSCHEWSKI B, SCHMIDT K, BEN ˇ O J, et al. Measuring procedures of cutting edge preparation when hard turning with coated ceramics tool inserts [ J] . Measurement, 2014, 55: 627-640.
[7] TANG L H, GAO C X, HUANG J L, et al. Experimental investigation of surface integrity in finish dry hard turning of hardened tool steel at different hardness levels[ J] . The international journal of advanced manufacturing technology, 2015, 77(9 / 10 / 11 / 12) : 1655 -1669.
[8] MARTELL J J, LIU C R, SHI J. Experimental investigation on variation of machined residual stresses by turning and grinding of hardened AISI 1053 steel[ J] . The international journal of advanced manufacturing technology, 2014, 74(9 / 10 / 11 / 12) : 1381-1392.
[9] KUNDRAK J, GYANI K, BANA V. Roughness of ground and hard-turned surfaces on the basis of 3D parameters [ J ] . The international journal of advanced manufacturing technology, 2008, 38 ( 1 / 2 ) : 110-119.
[10] 唱佳林, 李安海. 42CrMo 钢多工步车削加工表面完整性研究[ J] . 工具技术, 2021, 55(7) : 49-53. CHANG J L, LI A H. Surface integrity of 42CrMo steel in multi-step turning [ J ] . Tool engineering, 2021, 55(7) : 49-53.
[11] SCHUBNELL J, PONTNER P, WIMPORY R C, et al. The influence of work hardening and residual stresses on the fatigue behavior of high f frequency mechanical impact treated surface layers [ J ] . International journal of fatigue, 2020, 134: 105450.
[12] SPRINGER P, PRAHL U. Characterisation of mechanical behavior of 18CrNiMo7-6 steel with and without nb under warm forging conditions through processing maps analysis[ J] . Journal of materials processing technology, 2016, 237: 216-234.
[13] 张银霞, 原少帅, 王子乐, 等. 18CrNiMo7-6 钢高速外圆磨削残余应力和硬度的试验分析[ J] . 金刚石与磨料磨具工程, 2021, 41(1) : 65-70.
ZHANG Y X, YUAN S S, WANG Z L, et al. Experimental analysis of residual stress and hardness of 18CrNiMo7-6 steel in high speed cylindrical grinding [ J ] . Diamond & abrasives engineering, 2021, 41 (1) : 65-70.
[14] 王栋, 律谱, 陈真真. 三维表面粗糙度对 18CrNiMo7-6 钢旋转弯曲疲劳寿命的影响 [ J] . 表面技术, 2019, 48(11) : 283-289.
WANG D, LYU P, CHEN Z Z. Effect of three-dimensional surface roughness on rotating bending fatigue life of 18CrNiMo7-6 steel[ J] . Surface technology, 2019, 48(11) : 283-289.
[15] JOSEFSON B L, STIGH U, HJELM H E. A nonlinear kinematic hardening model for elastoplastic deformations in grey cast iron[ J] . Journal of engineering materials and technology, 1995, 117(2) : 145-150.
[16] 原少帅. 高速外圆磨削表面完整性与疲劳试样机加工工艺研究[D] . 郑州:郑州大学, 2021.
YUAN S S. Study on surface integrity of high-speed cylindrical grinding and machining technology of fatigue specimens [ D] . Zhengzhou:Zhengzhou University, 2021.
[17] 国家质量监督检验检疫总局, 中国国家标准化管理委员会. 金属显微组织检验方法: GB / T 13298— 2015[ S] . 北京: 中国标准出版社, 2016.
General Administration of Quality Supervision, Inspection and Quarantine of the People′s Republic of China, Standardization Administration of the People′s Republic of China. Inspection methods of microstructure for metals: GB / T 13298—2015[S]. Beijing: Standards Press of China, 2016.

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Last Update: 2022-08-20