中国激光, 2015, 42 (7): 0703001, 网络出版: 2022-09-24
不同工艺温度对IN718合金激光温喷丸后残余应力和纳米硬度的影响
Effect of Different Process Temperatures on Residual Stress and Nano-Hardness of Warm Laser Peened INl718 Superalloy
激光技术 激光温喷丸 残余应力 高温释放 纳米硬度 laser technique IN718 INl718 warm laser peening residual stress thermal relaxation nano-hardness
摘要
激光温喷丸工艺(WLP)结合了激光喷丸强化(LP)和动态应变时效(DSA)的双重优势。为了研究不同工艺温度对IN718合金WLP 后高温表面性能稳定性的影响,选取不同温度条件下,即LP(25 ℃)和WLP(230 ℃、260 ℃、290 ℃、320 ℃)的IN718 合金为研究对象,通过高温保持试验和纳米压痕试验,以残余压应力、纳米硬度和弹性模量为表征指标,探讨了温度效应对WLP 后高温表面性能稳定性的影响。结果表明,随着WLP 工艺温度的升高,残余压应力呈递减的趋势;随着保温温度的升高,LP 和WLP 处理后试样表面残余应力释放幅度均明显增大,但前者释放速度更快;通过载荷-位移曲线可进一步确定温度效应对IN718 合金WLP 后高温释放行为的影响,且260 ℃下处理的WLP IN718合金表面在高温下具有更好的稳定性。
Abstract
Warm laser peening process (WLP) is an innovative processing technique, which combines the advantages of laser peening (LP) and dynamic strain aging (DSA). In order to study the effect of different process temperatures on the thermal surface stability of WLP IN718, the LP(25 ℃) IN718 and WLP(230 ℃, 260 ℃, 290 ℃, 320 ℃ ) IN718 are served as the research objects. From the view points of compressive residual stress, nanohardness and elasticity modulus, the effects of different process temperatures on the thermal surface stability of WLP IN718 are explored by thermal insulation test and nano-indentation test. The results show that the compressive residual stress presents an decreasing trend with increasing the WLP temperature. LP and WLP samples thermal relaxation amplitude increase significantly with increasing the applied temperature, and the WLP samples have a better performance. WLP (260 ℃) IN718 has a best performance on thermal stability and nano-hardness, and the load-displacement curve further evidences the effect of temperature on thermal relaxation of WLP IN718 superalloy.
周建忠, 韩煜航, 黄舒, 盛杰, 孟宪凯, 章海峰, 徐苏强. 不同工艺温度对IN718合金激光温喷丸后残余应力和纳米硬度的影响[J]. 中国激光, 2015, 42(7): 0703001. Zhou Jianzhong, Han Yuhang, Huang Shu, Sheng Jie, Meng Xiankai, Zhang Haifeng, Xu Suqiang. Effect of Different Process Temperatures on Residual Stress and Nano-Hardness of Warm Laser Peened INl718 Superalloy[J]. Chinese Journal of Lasers, 2015, 42(7): 0703001.