蒋文春, 董志龙, 解学方, 王胜昆, 万娱, 涂善东. 考虑多尺度残余应力释放的焊接接头高/低周疲劳寿命预测方法[J]. 金属学报, DOI: 10.11900/0412.1961.2025.00123.

摘要 相关文章 Metrics 全文: PDF(1817 KB)   摘要: 目前，多尺度焊接残余应力释放行为对承压设备疲劳失效的影响机制尚无统一定论。本工作以SAF 2205双相不锈钢焊接接头为研究对象，采用实验和模拟相结合的方法，揭示了多尺度焊接残余应力随循环周次的释放行为，提出了多尺度焊接残余应力释放预测模型，阐明了焊接残余应力释放对疲劳损伤行为的影响机制。结果表明，低周疲劳时，焊接残余应力完全释放并转化为塑性变形，显著提升了焊缝的应变幅值，导致焊缝失效对应的应力幅范围变宽。高周疲劳时，试样中心表面高水平焊接残余应力导致裂纹启裂位置由试样侧面转移至中心表面；晶界奥氏体与周围晶粒显著的力学性能差异及焊接残余应力拉-压属性不匹配导致的牵制作用导致裂纹萌生寿命降低。基于上述研究，建立了考虑焊接残余应力释放的疲劳寿命预测模型，预测结果与实验数据吻合较好，误差小于20%。 关键词 ： 焊接接头,  多尺度,  残余应力释放,  高/低周疲劳寿命预测     Abstract：Recently, in the manufacturing industry, advancements toward high-parameter and lightweight designs has resulted in an increasing prominence on the influence of multiscale residual stress on the fatigue failure of pressure equipment. However, there is no unified conclusion on the influence of multiscale welding residual stress relaxation behavior on the fatigue failure of pressure equipment. This could be due to the following factors: (i) the multiscale coupling characteristics of residual stress, (ii) complexity of material microstructure, and (iii) dynamic evolution of stress relaxation behavior under cyclic loading. These factors hinder traditional fatigue life prediction methods to accurately evaluate the service performance of welded structures with residual stress. Therefore, this study utilizes SAF 2205 duplex stainless steel welded joints and reveals the relaxation behavior of multiscale residual stresses with the number of fatigue cycles. Additionally, this study proposes a predictive model for multiscale residual stress relaxation and clarifies the influence mechanism of residual stress relaxation on fatigue damage behavior. The results show that under low-cycle fatigue conditions, residual stresses are completely relaxed and converted into plastic deformation, which markedly increases the strain amplitude of the weld and broadens the stress amplitude range leading to weld fracture. Under high-cycle fatigue conditions, high-level residual stress shifts the crack initiation site from the specimen side surface to the specimen central surface. The substantial mechanical property difference between grain boundary austenite and surrounding grains, together with the constraint effect induced by the mismatch between the tensile and compressive attributes of residual stresses reduces the crack initiation life. Based on the above research, this study establishes a fatigue life prediction model considering residual stress relaxation. The results agree well with the experimental data, with a prediction error of less than 20%. Key words： Welded joints    Multi-scale    Relaxation of residual stresses    High/low cycle fatigue life prediction 收稿日期: 2025-05-08      基金资助:国家杰出青年科学基金(52325502) 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 蒋文春 董志龙 解学方 王胜昆 万娱 涂善东 44.8K 链接本文: https://www.ams.org.cn/CN/Y0/V/I/0 [1] 张天昊, 鞠泉, 蒙肇斌, 王浩, 胡本芙. GH3230合金薄板填丝钨极氩弧焊接头的组织稳定性[J]. 金属学报, 2025, 61(9): 1375-1386. [2] 游云翔, 谭力, 高静静, 周涛, 周志明. 利用热轧制-剪切-弯曲工艺及退火调控Mg-Al-Zn-Mn-Ca 镁合金的织构[J]. 金属学报, 2025, 61(6): 866-874. [3] 周任远, 朱丽慧. Inconel 740H焊接接头不同温度蠕变后 γ′贫化区的形成及其对力学性能的影响[J]. 金属学报, 2025, 61(5): 744-756. [4] 郑潇禹, 陈辛, 何美玲, 黄奇, 李亚, 孔毅, 杜勇. 基于晶体塑性的6XXX铝合金力学性能多尺度计算[J]. 金属学报, 2025, 61(11): 1758-1768. [5] 白菊菊, 李健健, 付崇龙, 陈双建, 李志军, 林俊. GH3535合金焊缝高温氦离子辐照效应[J]. 金属学报, 2024, 60(3): 299-310. [6] 沈雪阳, 褚瑞轩, 蒋宜辉, 张伟. 相变存储器材料设计与多尺度模拟的研究进展[J]. 金属学报, 2024, 60(10): 1362-1378. [7] 李时磊, 李阳, 王友康, 王胜杰, 何伦华, 孙光爱, 肖体乔, 王沿东. 基于中子与同步辐射技术的工程材料/部件多尺度残余应力评价[J]. 金属学报, 2023, 59(8): 1001-1014. [8] 吴进, 杨杰, 陈浩峰. 纳入残余应力时不同拘束下DMWJ的断裂行为[J]. 金属学报, 2022, 58(7): 956-964. [9] 刘中秋, 李宝宽, 肖丽俊, 干勇. 连铸结晶器内高温熔体多相流模型化研究进展[J]. 金属学报, 2022, 58(10): 1236-1252. [10] 骆文泽, 胡龙, 邓德安. SUS316不锈钢马鞍形管-管接头的残余应力数值模拟及高效计算方法开发[J]. 金属学报, 2022, 58(10): 1334-1348. [11] 王冠杰, 李开旗, 彭力宇, 张壹铭, 周健, 孙志梅. 高通量自动流程集成计算与数据管理智能平台及其在合金设计中的应用[J]. 金属学报, 2022, 58(1): 75-88. [12] 兰亮云, 孔祥伟, 邱春林, 杜林秀. 基于多尺度力学实验的氢脆现象的最新研究进展[J]. 金属学报, 2021, 57(7): 845-859. [13] 朱敏, 欧阳柳章. 镁基储氢合金动力学调控及电化学性能[J]. 金属学报, 2021, 57(11): 1416-1428. [14] 杨杰, 王雷. 核电站DMWJ中材料拘束的影响与优化[J]. 金属学报, 2020, 56(6): 840-848. [15] 陈芳,李亚东,杨剑,唐晓,李焰. X80钢焊接接头在模拟天然气凝析液中的腐蚀行为[J]. 金属学报, 2020, 56(2): 137-147. Viewed Full text Abstract Cited   Shared      Discussed