Mechanism and Size Characteristics of Micro Crack on Polished Ti6Al4V

doi:10.7652/xjtuxb201512019

您当前的位置：

首页 >

文章列表页 >

Mechanism and Size Characteristics of Micro Crack on Polished Ti6Al4V

更新时间：2025-07-09

- Mechanism and Size Characteristics of Micro Crack on Polished Ti6Al4V
- Vol. 49, Issue 12, Pages: 117-123(2015)
- 作者机构：
  
  西安交通大学机械制造系统工程国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201512019
  CLC： TG665
- Online First：10 December 2015，
  
  Published：2015
- 稿件说明：
移动端阅览
Mechanism and Size Characteristics of Micro Crack on Polished Ti6Al4V[J]. 2015, 49(12): 117-123.
DOI：

Mechanism and Size Characteristics of Micro Crack on Polished Ti6Al4V[J]. 2015, 49(12): 117-123. DOI： 10.7652/xjtuxb201512019.

摘要

为研究脉冲激光抛光过程中微裂纹产生机理及抛光主要参数对微裂纹尺寸特征的影响规律

建立了脉冲激光抛光温度场与应力场的有限元计算模型。在有限元模型建立过程中

采用温度场与应力场的顺序耦合方式

考虑了相变潜热和随温度显著变化的材料参数

得到了温度场与应力场在时间上和空间上的变化规律。通过温度场、应力场以及Ti6Al4V钛合金的凝固过程分析

揭示了Ti6Al4V钛合金激光抛光过程中微裂纹产生机理与尺寸特征规律。通过脉冲激光抛光实验验证有限元计算模型的有效性

结果表明:Ti6Al4V钛合金激光抛光微裂纹产生于Ti6Al4V钛合金的凝固时刻

微裂纹的宽度决定于Ti6Al4V钛合金凝固时刻热应力引起的塑性变形

微裂纹的深度决定于Ti6Al4V钛合金激光抛光熔池深度; 激光功率是微裂纹尺寸特征的主要影响因素

激光功率增大时微裂纹宽度及深度均显著增大; 在脉冲激光抛光中可通过外加预热的方式减缓熔融态金属的冷却速度

以减小抛光后的表面裂纹

有效减小微裂纹尺寸特征。

Abstract

The mechanism and size characteristics of micro crack on polished surface of Ti6Al4V are discussed by numerical simulation and experimental investigation. The latent heat of material phase change and material parameters varying with temperature are considered in this model. The change rules of temperature and stress fields in time domain and space domain are acquired and the finite element model is verified by experiments. The micro cracks generation mechanism and size characteristics of pulse polished Ti6Al4V are revealed via analysis of temperature field

stress field and solidification processes of the Ti6Al4V. The micro cracks of laser polishing are formed at solidification initiation moment

and the width of micro cracks is determined by plastic deformation and the micro crack depth depends on depth of molten pool. The laser power exerts the most significant influence on the size characteristics of micro cracks. The width and depth of the micro cracks all obviously increase with the increasing laser power. The cooling rate of the molten metal can be slowed down by preheating in the pulse laser polishing process to effectively decrease the size of micro cracks.

关键词

Keywords

references

PFEFFERKORN F E, DUFFIE N A, LI X, et al. Improving surface finish in pulsed laser micro polishing using thermocapillary flow [J]. CIRP Annals: Manufacturing Technology, 2013, 62(1): 203-206.

CHOW M T C, HAFIZ A M K, TUTUNEA-FATAN O R, et al. Experimental statistical analysis of laser micropolishing process [C]∥Proceeding of 2010 International Symposium on Optomechatronic Technologies. Piscataway, NJ, USA: IEEE, 2010: 1-6.

UKAR E, LAMIKIZ A, LPEZ DE LACALLE L N, et al. Laser polishing of tool steel with CO2 laser and high-power diode laser [J]. International Journal of Machine Tools and Manufacture, 2010, 50(1): 115-125.

KUMSTEL J, KIRSCH B. Polishing Titanium- and Nickel-based alloys using CW-laser radiation [J]. Physics Procedia, 2013, 41: 362-371.

LAMIKIZ A, SÁNCHEZ J A, LPEZ DE LACALLE L N, et al. Laser polishing of parts built up by selective laser sintering [J]. International Journal of Machine Tools and Manufacture, 2007, 47(12/13): 2040-2050.

HAFIZ A M K, BORDATCHEV E V, TUTUNEA-FATAN R O. Influence of overlap between the laser beam tracks on surface quality in laser polishing of AISI H13 tool steel [J]. Journal of Manufacturing Processes, 2012, 14(4): 425-434.

VADALI M, MA C, DUFFIE N A, et al. Effects of pulse duration on laser micro polishing [J]. Journal of Micro and Nano-Manufacturing, 2013, 1(1): 11006.

NÜSSER C, WEHRMANN I, WILLENBORG E. Influence of intensity distribution and pulse duration on laser micro polishing [J]. Physics Procedia, 2011, 12: 462-471.

GUO W, HUA M, TSE P W, et al. Process parameters selection for laser polishing DF2(AISI O1)by Nd: YAG pulsed laser using orthogonal design [J]. The International Journal of Advanced Manufacturing Technology, 2012, 59(9/10/11/12): 1009-1023.

BORDATCHEV E V, HAFIZ A M K, TUTUNEA-FATAN O R. Performance of laser polishing in finishing of metallic surfaces [J]. International Journal of Advanced Manufacturing Technology, 2014, 73(1/2/3/4): 35-52.[11] 程建, 孙琨, 马利锋, 等. 激光重熔合成Fe-Al涂层温度场及应力场数值模拟 [J]. 材料热处理学报, 2014, 35(8): 219-225.

CHENG Jian, SUN Kun, MA Lifeng, et al. Numerical simulation of temperature field and stress field of laser remelting synthesizing Fe-Al coating [J]. Transactions of Materials and Heat Treatment, 2014, 35(8): 219-225.

周兆锋, 陈明和, 范平, 等. 钛合金TC4热应力校形的数值模拟 [J]. 南京航空航天大学学报, 2009, 41(5): 620-625.

ZHOU Zhaofeng, CHEN Minghe, FAN Ping, et al. Numerical simulation on hot sizing of titanium alloy TC4 [J]. Journal of Nanjing University of Aeronautics Astronautics, 2009, 41(5): 620-625.

张勇, 綦秀玲. 不同变形速率、温度下TC4薄板焊接件屈服强度表征 [J]. 稀有金属材料与工程, 2013(5): 1091-1095.

ZHANG Yong, QI Xiuling. Yield strength of TC4 thin plate weldment under different deformation rates and temperatures [J]. Raremetal Materials and Engineering, 2013(5): 1091-1095.

曲兴田,王宏一,樊成,等.等重叠率螺旋线的非球面抛光轨迹规划[J].2015,49(6):126-131.[doi:10.7652/xjtuxb 201506020]

郑卜祥,姜歌东,王文君,等.超快脉冲激光对钛合金的烧蚀特性与作用机理[J].2014,48(12):21-28.[doi:10.7652/xjtuxb201412004]

刘丽娟,吕明,武文革.Ti-6Al-4V合金的修正本构模型及其有限元仿真[J].2013,47(7):73-79.[doi:10.7652/xjtuxb 201307014]

朱爱斌,路新春,张浩,等.铜化学机械抛光材料去除机理的准连续介质法研究[J].2011,45(12):111-116.[doi:10.7652/xjtuxb201112020]

王恪典,段文强,梅雪松,等.毫秒激光加工小孔与重铸层的后处理工艺[J].2011,45(7):45-49.[doi:10.7652/xjtuxb 201107009]

严伟林,方亮,孙琨,等.表面纳米化对高锰钢磨料磨损性能的影响[J].2007,41(5):611-615.[doi:10.7652/xjtuxb2007 05024]

谭富星,李明哲,蔡中义,等.钛合金网板多点成形起皱缺陷的数值模拟[J].2007,41(9):1026-1030.[doi:10.7652/xjtuxb200709005]

Views

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Windage Loss and Flow Characteristics in Impeller Back Gaps of sCO2 Radial Inflow Turbines

A Fast Calculation Method for Thermal Flow Fields in Transformer Windings Based on PI-DeepONet

Effects of Expansion Angle Crater Film Hole on the Film Cooling Characteristics of a Double-Wall Structure

Review of the Application of EBSILON Software in Combined Heat and Power System Optimization

Study on the Thermodynamic Properties in the Anomalous Region of Supercritical Water

Related Author

No data

Related Institution

No data

⁰