汪诚,戴鹏里,姚东野,谢孟芸,张佩宇,柴艳.LSPwC对时效后GH3044合金疲劳性能的影响[J].表面技术,2019,48(8):280-285.
WANG Cheng,DAI Peng-li,YAO Dong-ye,XIE Meng-yun,ZHANG Pei-yu,CHAI Yan.Influence of LSPwC on Fatigue Property of GH3044 Treated with Aging[J].Surface Technology,2019,48(8):280-285 |
| LSPwC对时效后GH3044合金疲劳性能的影响 |
| Influence of LSPwC on Fatigue Property of GH3044 Treated with Aging |
| 投稿时间：2018-11-06 修订日期：2019-08-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.08.037 |
| 中文关键词: 无保护层激光冲击强化 时效 碳化物 显微组织 高温应力松弛 疲劳寿命 |
| 英文关键词:laser shock peening without coating aging carbide microstruture high temperature stress relaxation fatigue life |
| 基金项目: |
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| Author | Institution |
| WANG Cheng | Key Laboratory of Plasma Dynamics, Air Force Engineering University, Xi’an 710038, China |
| DAI Peng-li | Key Laboratory of Plasma Dynamics, Air Force Engineering University, Xi’an 710038, China |
| YAO Dong-ye | Key Laboratory of Plasma Dynamics, Air Force Engineering University, Xi’an 710038, China |
| XIE Meng-yun | Key Laboratory of Plasma Dynamics, Air Force Engineering University, Xi’an 710038, China |
| ZHANG Pei-yu | Key Laboratory of Plasma Dynamics, Air Force Engineering University, Xi’an 710038, China |
| CHAI Yan | Key Laboratory of Plasma Dynamics, Air Force Engineering University, Xi’an 710038, China |
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| 中文摘要: |
| 目的 修复发生时效退化现象的GH3044合金，从而提高其使用寿命。方法 采用无保护层激光冲击强化（LSPwC）工艺处理GH3044合金时效试样，分析了该工艺处理前后试样表面的物相变化情况，研究了时效以及激光强化工艺对合金表层微观组织的影响，对比了激光强化前后合金试样高温应力松弛和疲劳寿命变化情况。结果 合金试样经过1200 ℃固溶处理后，其表面相为单相γ奥氏体以及WC，处理前后试样表面主要相组成不变，均为奥氏体和Cr23C6。经过时效处理100 h后，GH3044合金沿晶析出大量尺寸较大的碳化物，表面残余应力值约为-28.5 MPa，疲劳寿命约为1.013×106。通过LSPwC处理后，碳化物链式分布被打破，分布更加均匀弥散，表面残余应力值约为-479.3 MPa，其疲劳寿命提高至3.448×106，为时效试样的2.4倍；经过800 ℃保温120 min处理，试样表面残余应力为-324.2 MPa，下降约32%，说明该强化工艺处理后的试样具有较好的热稳定性。结论 LSPwC能够有效提高时效退化GH3044合金的疲劳性能。 |
| 英文摘要: |
| The work aims to repair the GH3044 alloy treated with aging and improve the service life. LSPwC was adopted to treat the aging GH3044 alloy. The change of the surface phase of the specimen was analyzed before and after the treatment. In addition, the effect of aging and the strengthening process on the microstructure of the alloy surface was studied, and the stress relaxation and fatigue life of the alloy specimens before and after the treatment were compared. After solid solution at 1200 ℃, the single phase of the alloy specimen was γaustenite and WC. The main phase composition of the specimens before and after the composite treatment remained the same as austenite and Cr23C6. After aging for 100 h, the amount of carbide increased and the intercrystalline precipitation was obvious. Moreover, the surface residual stress value was -28.5 MPa and the fatigue life was about 1.013×106. After LSPwC, the carbide chains were broken and distributed more evenly. The surface residual stress was about -479.3 MPa and the fatigue life increased to 3.448×106, which was about 2.4 times higher than that of the aging specimen. After 120 min heat preservation at 800 ℃, the surface residual stress dropped by 32% and was -324.2 MPa, thus indicating that the specimen after strengthening process had better thermal stability. LSPwC can effectively improve the fatigue property of GH3044 alloy after aging treatment. |
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