Evaluation Reliability of Hybrid Surface Modification Material by Carburizing and Fine Particle Peening

渗碳和细颗粒喷丸混合表面改性材料的可靠性评价

基本信息

批准号：
10650103
负责人：
EGAMI Noboru
金额：
$ 1.66万
依托单位：
Meijo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650103/
关键词：
Hybrid Surface Modification Fine Particle Peening Fatigue S-N Cueve Crack initiation Life Mechanical Properties Diffraction Pattern of Product Fracture Mechanics 表面改賃複合処理浸炭窒化残留応力疲労強度応力拡大係数幅浸炭処理疲労き裂圧縮残留応力

项目摘要

(1)This study examines the effect of hybrid surface modification by vacuum carburizing and fine particle peening on fatigue strength behaviors of SCM415 material. We used quenched, vacuum carburized and hybrid, vacuum carburized and fine particle peened, specimen made of SCM415 and measured their hardness distribution, mechanical properties, fatigue strength and crack propagation. In terms of the fatigue behaviors, we investigated the relationship between the crack propagation rate da/dN and stress intensity factor range ΔK, da/dN and effective stress intensity factor range ΔKeff, as well as the fatigue crack initiation life N_i and crack failure life N_f of specimens. The results show specimens with hybrid surface modification are effective in the prevention of fatigue crack initiation and fatigue crack propagation.(2)This study examines numerical analysis of particle velocity and temperature distribution of struck material surface in fine particle peening. When the particle is accelerated using a direct-pressure type, the velocity of a 50μm particle, just before striking the metal surface, was calculated to be 222m/s. In applying air pressure, the acceleration of fine particles show significant increase compared to larger sizes. Moreover, the experimental values agree well with the calculated ones. On the other hand, the temperature distributions show the maximum surface temperature to be 1000K and cools instantly.

（1）这项研究通过真空渗透和细粒子剥离对SCM415材料的疲劳强度行为的杂交表面修饰的影响。我们使用了猝灭，真空化和杂种，真空化碳化和细粒子，由SCM415制成的标本，并测量其硬度分布，机械性能，疲劳强度和裂纹繁殖。就疲劳行为而言，我们研究了裂纹传播速率DA/DN与应力强度因子范围ΔK，DA/DN和有效的应力强度因子范围ΔKeff，以及疲劳裂纹启动life n_i和裂纹的物种life n_f物种的life n_f。结果表明，具有杂化表面修饰的物种有效地预防疲劳裂纹启动和疲劳裂纹的传播。（2）这项研究检查了对细颗粒剥离中撞击物质表面的颗粒速度和温度分布的数值分析。当使用直接压力类型加速粒子时，在撞击金属表面之前，粒子的速度为222m/s。在施加气压时，与较大尺寸相比，细颗粒的加速度显示出显着增加。此外，实验值与计算出的值非常吻合。另一方面，温度分布显示最高表面温度为1000k，并立即冷却。