周文龙,吕成,李烨,何声馨.喷丸强度对316不锈钢表面完整性及疲劳寿命的影响[J].表面技术,2020,49(7):230-237.
ZHOU Wen-long,LYU Cheng,LI Ye,HO Hsinshen.Effect of Shot Peening Intensity on Surface Integrity and Fatigue Life of 316 Stainless Steel[J].Surface Technology,2020,49(7):230-237 |
| 喷丸强度对316不锈钢表面完整性及疲劳寿命的影响 |
| Effect of Shot Peening Intensity on Surface Integrity and Fatigue Life of 316 Stainless Steel |
| 投稿时间：2019-08-20 修订日期：2020-07-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2020.07.029 |
| 中文关键词: 316不锈钢 喷丸强度 表面完整性 拉伸性能 疲劳寿命 |
| 英文关键词:316 stainless steel almen intensity surface integrity tensile property fatigue life |
| 基金项目:国家自然科学基金（51650110502） |
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| Author | Institution |
| ZHOU Wen-long | School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China |
| LYU Cheng | School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China |
| LI Ye | School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China |
| HO Hsinshen | School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China |
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| 中文摘要: |
| 目的 阐明喷丸强度对316不锈钢疲劳寿命的影响机制。方法 不同喷丸强度处理的316不锈钢试样经化学腐蚀后，利用光学显微镜观察其微观结构的变化。采用白光干涉仪、维氏显微硬度测量系统、X射线应力分析仪等，分析喷丸处理前后316不锈钢试样的表面轮廓、表面粗糙度、显微硬度以及残余应力等的变化。利用疲劳试验机测得喷丸处理前后316不锈钢试样的拉伸性能和疲劳寿命。结果 喷丸处理后，试样表面粗糙度明显增加，随着喷丸强度的增大，表面粗糙度Sa由0.04 μm增至6.73 μm。此外，喷丸处理后，产生了从表层到材料基体的微结构梯度，随着喷丸强度的变化，表面变形层的厚度位于110~290 μm之间。喷丸过程中产生了加工硬化现象，并且引入了一定深度的残余压应力层。随着喷丸强度的增大，喷丸处理试样显微硬度的最大值由356HV0.1增至435HV0.1，残余压应力的最大值由-633 MPa增至-750 MPa。与未喷丸试样相比，喷丸处理改善了材料的力学性能和疲劳特性，喷丸试样的塑性应变幅值降低，疲劳寿命明显增加。结论 喷丸处理能够有效地改善316不锈钢的综合力学性能，增加其疲劳寿命。不同强度的喷丸处理效果差异明显，在喷丸强度为0.35 mmA时，达到最优喷丸效果。 |
| 英文摘要: |
| The work aims to clarify the influence mechanism of shot peening intensity on fatigue life of 316 stainless steel. After chemical corrosion, the change of microstructure of 316 stainless steel subjected to shot peening with different intensity was observed by optical microscope. Then the changes in surface profile, surface roughness, microhardness and residual stress before and after shot peening were analyzed by white light interferometer, digital vickers microhardness tester and X-ray residual stress analyzer respectively. The tensile properties and fatigue life before and after shot peening were also measured by fatigue testing machine. After shot peening, the surface roughness of the specimens increased obviously and Sa value increased from 0.04 μm to 6.73 μm with the increase of peening intensity. In addition, shot peening produced a microstructural gradient from the near surface region to the bulk material with the total thickness of the near surface deformed layer lying between 110 μm and 290 μm, which was dependable on the peening intensity. During shot peening, work hardening occurred and a certain depth of residual compressive stress layer was introduced. By increasing the peening intensity, the maximum microhardness and compressive residual stress augmented from 356HV0.1 to 435HV0.1 and from -633 MPa to -750 MPa, respectively. Compared with the un-peened specimens, shot peening improved the behavior and properties of the peened specimens. The plastic strain amplitude was decreased, but the fatigue lifetime of peened specimens was increased. Shot peening can effectively improve the comprehensive mechanical properties of 316 stainless steel and increase its fatigue life. The effect of shot peening with different intensity is obviously different. When the shot peening intensity is 0.35 mmA, the best shot peening effect is achieved. |
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