|
| Study on mechanism of flake initiation based on the cohesion method |
| Received:March 29, 2018 Revised:July 28, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20180329001 |
| KeyWord:flakes initiation the theory of cohesion zone modelling hydrogen accumulation under the stress gradient hydrogen pressure theory multi-crack |
| Author | Institution |
| 范俊锴 |
河南理工大学 机械与动力工程学院, 焦作 |
| 彭波 |
河南理工大学 机械与动力工程学院, 焦作 |
| 侯高杰 |
河南理工大学 机械与动力工程学院, 焦作 |
| 杜凤山 |
燕山大学 国家冷轧板带装备及工艺工程技术研究中心, 秦皇岛 |
|
| Hits: 1355 |
| Download times: 612 |
| Abstract: |
| Based on the previous experimental studies,a finite element model of flake initiation was established.The theories of cohesive strength,hydrogen pressure and stress induced hydrogen diffusion were coupled in this model.The effects of hydrogen content,crack length and multi-crack coupling on flake formation were studied.Meanwhile,the critical hydrogen concentration and its changing trends for flake formation under different conditions were determined.The results show that hydrogen is of important effect on the initiation of flakes.During the process of flake formation,a high concentration of hydrogen was accumulated at the crack tip,which is greatly reduces the cohesive strength of steel.As for a single crack,the critical hydrogen concentration of the flake initiation gradually decreases and tends to a steady value with the crack length increasing.When a plurality of dense small cracks are present at the same time,the small cracks tend to form large cracks because of the effect of stress coupling,while the distal cracks has less influence on the flake initiation.For multiple cracks,the critical hydrogen concentration at the flake initiation tends to decrease linearly with the increase of the number of cracks. |
|
|
|