深冷处理对抗氢钢薄壁构件初始残余应力及变形的影响  

Effect of cryogenic treatment on the initial residual stress and deformation of hydrogen-resistant steel thin-walled components

作　　者：尚逢祥 孔金星[1] 李昀桦 SHANG Fengxiang;KONG Jinxing;LI Yunhua(Institute of Mechanical Manufacturing Technology,China Academy of Engineering Physics,Mianyang 621900,CHN)

机构地区：[1]中国工程物理研究院机械制造工艺研究所,四川绵阳621900

出　　处：《制造技术与机床》2022年第7期109-115,共7页Manufacturing Technology & Machine Tool

基　　金：国家重点研发计划(2019YFB2005405);国家自然科学基金(51805498)。

摘　　要：为减小初始残余应力对抗氢钢薄壁构件加工变形的影响,基于轮廓法研究了不同深冷参数与高温复合时效对初始残余应力的影响,采用慢走丝加工模拟材料去除,研究初始残余应力释放对抗氢钢薄壁平面构件变形的影响。结果表明:锻造后未经时效处理的抗氢钢初始残余应力呈现内拉外压的分布特征,残余拉应力峰值为300 MPa;经过350℃2 h、−130℃10 h、350℃2 h深冷处理后的试样残余应力空间分布特性保持稳定,残余拉应力峰值降低至100 MPa,应力幅值降低了66.7%。随着材料去除量的增加,不同时效处理试样的加工变形量随之增加。锻造后未处理试样变形最大,而350℃2 h、−130℃10 h、350℃2 h处理试样变形最小,当去除量为1.6 mm和3.2 mm时,两种时效的薄壁平面构件加工变形降低了66.7%和44.4%。In order to reduce the effect of initial residual stress on the processing deformation of hydrogen-resistant steel thin-walled components,the effect of different cryogenic parameters and high-temperature compound aging on the initial residual stress was investigated based on the contour method,and the effect of initial residual stress release on the deformation of hydrogen-resistant steel thin-walled flat components was studied by simulating material removal using slow-walking processing.The results show that:the initial residual stresses in the forged hydrogen-resistant steel without aging treatment show the distribution characteristics of tensile stress on internal and compression stress on external,and the peak of residual tensile stress is 300 MPa;the spatial distribution characteristics of the residual stresses in the specimens after cryogenic treatment at 350℃for 2 h,−130℃for 10 h and 350℃for 2 h remain stable,and the peak of residual tensile stress is reduced to 100 MPa,the stress amplitude is reduced by 66.7%.The specimens’processing deformation of different aging treatments increased accordingly with the increase of material removal.The deformation of the untreated specimens after forging was the largest,and the deformation of the specimens treated at 350℃for 2 h,−130℃for 10 h and 350℃for 2 h was the smallest,and the processing deformation of the thin-walled flat components with both types of aging was reduced by 66.7%and 44.4%when the removal amount was 1.6 mm and 3.2 mm.

关 键 词：抗氢钢 深冷处理 轮廓法 初始残余应力 加工变形 

分 类 号：TG156.91[金属学及工艺—热处理]