CAJ | 학술논문

目的：消减预拉伸铝板内部残余应力。方法利用短波长 X 射线衍射仪(SWXRD),分别对某公司国产25 mm 厚2024-T351预拉伸铝板,以及美国铝业公司(ALCOA)20 mm 厚7075-T651预拉伸铝板的内部残余应力、内部织构及其沿板厚的分布,进行了无损测定。结果 ALCOA 的20 mm 厚7075预拉伸铝板内部残余应力小于25 MPa,其内部晶粒取向沿板厚均匀分布；而某公司原工艺生产的25 mm 厚2024预拉伸铝板,内部残余应力高达100 MPa 左右,其内部晶粒取向沿板厚分布很不均匀。结论源自于轧制的内部织构沿板厚分布的不均匀性,使得以消减残余应力为目的的预拉伸处理中的铝板塑性变形不均匀,导致某公司国产预拉伸铝板内部残余应力的消减效果差,在其后续加工中容易产生加工变形超差的问题,需要抑制强剪切织构的产生,减小织构在整个板材厚度上的不均匀分布程度。
목적：소감예랍신려판내부잔여응력。방법이용단파장 X 사선연사의(SWXRD),분별대모공사국산25 mm 후2024-T351예랍신려판,이급미국려업공사(ALCOA)20 mm 후7075-T651예랍신려판적내부잔여응력、내부직구급기연판후적분포,진행료무손측정。결과 ALCOA 적20 mm 후7075예랍신려판내부잔여응력소우25 MPa,기내부정립취향연판후균균분포；이모공사원공예생산적25 mm 후2024예랍신려판,내부잔여응력고체100 MPa 좌우,기내부정립취향연판후분포흔불균균。결론원자우알제적내부직구연판후분포적불균균성,사득이소감잔여응력위목적적예랍신처리중적려판소성변형불균균,도치모공사국산예랍신려판내부잔여응력적소감효과차,재기후속가공중용역산생가공변형초차적문제,수요억제강전절직구적산생,감소직구재정개판재후도상적불균균분포정도。
Objective To decrease the residual stress in pre-stretch plates. Methods The internal residual stress, in-ternal texture and its distribution along the plate thickness were measured non-destructively for the domestic produced 2024-T351 aluminum alloy pre-stretch plate with a thickness of 25 mm and the ALCOA 7075-T651 aluminum alloy pre-stretch plate with a thickness of 20 mm by means of the self -developed short -wavelength X-ray diffractometer ( SWXRD). Results The results showed that the internal residual stress was less than 25 MPa and the internal texture was homogeneous along the plate thickness for the ALCOA 7075-T651 aluminum alloy plate, and the internal residual stress was much higher (reaching about 100 MPa) and the internal texture was quite inhomogeneous along the plate thickness for the domestic 2024-T351 aluminum alloy plate. Conclusion The inhomogeneous distribution of the internal texture along the plate thick-ness led to the inhomogeneous plastic deformation of the aluminum plate in the pre-stretch treatment aimed to reduce the residue stress, and finally caused the poor reduction of internal residue stress by the domestic aluminum alloy pre-stretch plates. Therefore, suitable rolling process should be adopted to obtain homogeneous texture,and the strong shear texture should be restrained to increase the texture homogenization.