排序方式: 共有13条查询结果,搜索用时 15 毫秒
1.
2.
3.
目的 去除焊接管件焊缝处的氧化皮,改善焊缝处的应力状态。方法 采用振动辅助磁针磁力研磨法去除导磁材质管件经焊接处理后焊缝表面的氧化皮,利用超景深电子显微镜观察氧化皮的去除情况;利用X射线能谱分析仪对焊缝表面氧化皮的成分进行分析,根据氧化皮及管件材料主要元素的占比情况,分析检测焊缝表面氧化皮是否被完全去除。结果 焊缝表面氧化皮经振动辅助磁针磁力研磨后被完全去除。通过对比振动辅助磁针磁力研磨前后的表面形貌发现,表面颜色由黑变光亮,氧化皮得到有效去除。通过EDS成分分析可知,氧化皮的主要成分为C元素,质量分数为88.62%;管切面显示基体的主要成分为Fe元素,质量分数为67.09%。通过振动辅助磁力研磨法去除氧化皮后,管表面的元素组成与研磨前相比C元素降低了85.52%,Fe元素增加了63.06%。表面残余应力由原始的+17.5 MPa变为?186.0 MPa。经研磨后,氧化皮基本被完全去除。结论 焊缝表面成分的检测结果证实,从表面形貌分析中得到氧化皮被完全去除的结论是正确的,同时也表明振动辅助磁针磁力研磨对完全去除焊缝表面的氧化皮具有可行性。 相似文献
4.
应变和氯离子浓度对304不锈钢点蚀敏感性的影响 总被引:2,自引:0,他引:2
The effects of strain and chloride concentration on pitting susceptibility for type 304 stainless steel were studied in situ using the electrochemical technology under constant strain. The impact factor fc was brought forward to value the effect of strain on pitting. The pitting behaviors of type 304 stainless steel in various chloride concentrations under the strain levels 0%, 10%, and 30% were investigated. Potentiostatic polarization technology was used to study how the chloride concentration affected corrosion current density. The results indicated that fc increased substantially and pitting potential varied remarkably when chloride concentration was over 90 mg.L . Under the three levels of strain mentioned above, when chloride concentration was below 463 mg.L^-1,121 mg.L^-1, and 98 mg.L^-1 respectively, the pitting potential shifted towards positivity and, the passive film became more stable. When the strain was below 10%, the pitting susceptibility of type 304 stainless steel varied greatly as strain increased, whereas the susceptibility only changed a little when the strain was over 10%. 相似文献
5.
低硬度循环冷却水中Cl^-、SO4^2-及水处理剂对304不锈钢腐蚀行为的影响 总被引:3,自引:0,他引:3
采用极化曲线、电化学噪声、电化学阻抗谱(EIS)和能量色散谱(EDS)等方法研究Cl-、SO42-及水处理剂RP-98H对304不锈钢在低硬度循环冷却水中腐蚀行为的影响.探讨了RP-98H对304不锈钢在低硬度循环冷却水中的缓蚀机理.结果表明,Cl-增强了304不锈钢的点蚀敏感性,SO42-能够减缓Cl-的侵蚀,而RP-98H能够在304不锈钢表面迅速成膜,提高其点蚀电位.该水处理剂为混合型水处理剂,其缓蚀率可达84.8%,最佳使用浓度为100 mg/L. 相似文献
6.
7.
目的 设计一种低频交变磁场发生装置,高效率地去除H62黄铜管内的表面缺陷,提高其表面质量,延长其使用寿命。方法 采用闭合铁芯的方式设计一种低频磁场发生装置,利用EDEM软件对磁场中的磁性磨粒进行运动仿真分析;对电磁线圈的缠绕方式、通电方式进行设计,并利用Ansys软件对不同的线圈缠绕方式和通电方式所产生的磁场进行模拟分析。数控车床夹持管件旋转,并与磁场发生装置相配合,使管件中的磁性磨粒在磁场中磁化,并紧贴管件内表面进行研磨抛光。使用触针式表面粗糙度测量仪和超景深 3D电子显微镜,对研磨前后的样品进行检测分析。结果 基于三端缠绕方式,采用2种不同的通电方式对管件进行研磨加工,采用相对型通电方式研磨6 min后,H62黄铜管内的表面粗糙度由原始的0.618 μm降至0.373 μm。采用相邻型通电方式研磨6 min后,H62黄铜管内的表面粗糙度由原始的0.667 μm降至0.081 μm。结论 利用低频交变磁场能够实现研磨工具(磁性磨粒)的循环更新,提高磁性磨粒的利用率。在采用三端缠绕方式通电时所产生的磁场强度更大,更适合于磁粒研磨加工。采用相邻型通电方式(N?N?S?S磁极排布)加工时,研磨压力更大,大幅缩短了加工时间,去除了管件内壁的原始缺陷。 相似文献
8.
9.
The enrichment of chloride anion within the occluded cell (OC) for Type 304 austenitic stainless steel in low chloride concentration solution has been investigated by means of a simulated OC. The influence of the enrichment of chloride anion on stress corrosion crack (SCC) of Type 304 stainless steel has been studied. It was observed that the amount of chloride anion migration was proportional to the charge flowing through the anode. Owning to the effects of enrichment of chloride anion, low chloride concentration solution could induce SCC for Type 304 stainless steel. 相似文献
10.