红外与激光工程
紅外與激光工程
홍외여격광공정
INFRARED AND LASER ENGINEERING
2015年
8期
2274-2279
,共6页
焦阳%何卫锋%孙岭%周留成%聂祥樊%罗思海%李靖
焦暘%何衛鋒%孫嶺%週留成%聶祥樊%囉思海%李靖
초양%하위봉%손령%주류성%섭상번%라사해%리정
复合工艺%激光喷丸强化%渗铝%K417合金%显微硬度
複閤工藝%激光噴汍彊化%滲鋁%K417閤金%顯微硬度
복합공예%격광분환강화%삼려%K417합금%현미경도
composite technology%laser shock peening%aluminizing%K417 alloy%micro-hardness
对渗铝、渗铝后强化、强化后渗铝的K417合金试件分别进行振动疲劳试验。试验结果表明,相对于渗铝处理,强化后渗铝试样的疲劳强度提高了50%,而渗铝后强化试样的疲劳强度提高了30%,这说明渗铝与激光喷丸强化复合工艺可以提高材料的疲劳性能,且强化后渗铝效果更好。采用X射线衍射(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)分析激光喷丸强化与渗铝复合工艺顺序对材料力学性能的影响,讨论了疲劳性能的改善机理。结果表明,激光喷丸强化促进了渗铝过程,生成大量柱状晶,渗层厚度增加,渗层与基体的结合更加紧密,从而有效提升疲劳性能;而渗铝后强化主要对渗层表面进行了形变强化,疲劳性能的提升有限。
對滲鋁、滲鋁後彊化、彊化後滲鋁的K417閤金試件分彆進行振動疲勞試驗。試驗結果錶明,相對于滲鋁處理,彊化後滲鋁試樣的疲勞彊度提高瞭50%,而滲鋁後彊化試樣的疲勞彊度提高瞭30%,這說明滲鋁與激光噴汍彊化複閤工藝可以提高材料的疲勞性能,且彊化後滲鋁效果更好。採用X射線衍射(XRD)、掃描電子顯微鏡(SEM)和透射電子顯微鏡(TEM)分析激光噴汍彊化與滲鋁複閤工藝順序對材料力學性能的影響,討論瞭疲勞性能的改善機理。結果錶明,激光噴汍彊化促進瞭滲鋁過程,生成大量柱狀晶,滲層厚度增加,滲層與基體的結閤更加緊密,從而有效提升疲勞性能;而滲鋁後彊化主要對滲層錶麵進行瞭形變彊化,疲勞性能的提升有限。
대삼려、삼려후강화、강화후삼려적K417합금시건분별진행진동피로시험。시험결과표명,상대우삼려처리,강화후삼려시양적피로강도제고료50%,이삼려후강화시양적피로강도제고료30%,저설명삼려여격광분환강화복합공예가이제고재료적피로성능,차강화후삼려효과경호。채용X사선연사(XRD)、소묘전자현미경(SEM)화투사전자현미경(TEM)분석격광분환강화여삼려복합공예순서대재료역학성능적영향,토론료피로성능적개선궤리。결과표명,격광분환강화촉진료삼려과정,생성대량주상정,삼층후도증가,삼층여기체적결합경가긴밀,종이유효제승피로성능;이삼려후강화주요대삼층표면진행료형변강화,피로성능적제승유한。
Vibration fatigue tests were performed on aluminizing, LSP after aluminizing、aluminizing after LSP K417 alloy specimen respectively. The results showed that, compared with that treated by aluminizing only, the fatigue strength of specimen treated by aluminizing after LSP was improved by 50%and that treated by LSP after aluminizing was improved by 30%. It showed that the composite technology of LSP and aluminizing can improve the fatigue performance, and the composite technology of aluminizing after LSP can improve more effectively. The influence of different technology order to mechanical properties were investigated by X-ray diffraction (XRD), scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The improvement mechanism of the fatigue performance was discussed. The results indicate that the LSP can promote the process of aluminizing. The combination of aluminizing layer with matrix is more close and a large number of columnar crystals formed in the surface treated by aluminizing after LSP, which lead to the thickness of aluminizing layer increase, and then the fatigue performance improved. But the LSP after aluminizing only affects the surface strengthening, and the improvement of fatigue performance is limited.