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徐海洋超声波检测技术学习笔记(四十七)锻件与铸件超声波探伤技术要点与评级方法

  • 2026-05-08 11:18:01
徐海洋超声波检测技术学习笔记(四十七)锻件与铸件超声波探伤技术要点与评级方法

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锻件与铸件超声波探伤技术要点与评级方法

  • 锻件评级需根据缺陷面积与声场关系、底波变化及密集特征,采用不同方法并以 Φ4 为基准。

💡 核心结论:

  • 铸件因组织粗大、表面粗糙,探伤需选用特定探头、分层检测并制作专用试块。
  • 折叠、白点、空心、裂纹及铸件冷隔为危险缺陷,一经判定即评为最差质量等级。

锻件缺陷评级方法

缺陷类型

评级依据

核心方法

面积小于声场截面

当量直径

计算当量直径,统一用 Φ4±Δ 表示评级

面积大于声场截面

缺陷面积占比

测缺陷边界,计算占被检件面积比值查表

引起底波降低

底波降低量

对比无缺陷与有缺陷处底波高度百分比

密集缺陷

最大个体当量

分析密集区中突出回波,与 Φ2/Φ4 对比

铸件探伤特点与检测方法

铸件探伤特点

  • 组织不均匀 且晶粒粗大
  • 表面粗糙导致 声耦合差
  • 超声波散射严重, 穿透性差
  • 信噪比低,干扰信号多

铸件检测方法选择

  • 厚度 >45mm 用纵波单晶直探头
  • 厚度 <45mm 用纵波双晶直探头
  • 检测裂纹用 纵波单晶斜探头
  • 采用低频窄脉冲探头提高信噪比

大厚度铸件分层检测

  • 将铸件厚度分为 若干层
  • 每层使用 不同的检测灵敏度
  • 需制作 同炉批材料的专用试块
  • 通过调整扫描基线与闸门实现

危险缺陷判定

锻件中的危险缺陷

  • 折叠缺陷:应力集中源, 直接评最差级
  • 白点缺陷:性能同裂纹, 直接评最差级
  • 空心缺陷:影响横向力, 直接评最差级
  • 裂纹缺陷:无论尺寸,判定即最差级

铸件特有危险缺陷

  • 冷隔缺陷: 液态金属交汇处形成的缝隙
  • 危害性与裂纹相同, 不允许存在
  • 多出现在远离浇口的宽大表面或薄壁处

围绕轴类锻件和铸件的超声波探伤问题展开,详细讲解了轴类锻件的缺陷类型、检测方法、质量评级,以及铸件的特点、常见缺陷、检测特点和检测方法的选择等内容,具体如下:​

轴类锻件探伤​

缺陷类型:轴类锻件由于制造过程可能存在缩孔、疏松、夹杂、白点、空心五种缺陷,且这些缺陷都处于轴类锻件的中心部位。​

检测方法​

探头移动方向:纵波探头沿圆周方向检测时无法测量缺陷面积,因此探头只能沿轴的轴向方向移动,当移动距离超过探头半径,底波幅度降低或消失,可判断密集区间长度等情况。​

缺陷面积判别:当探头沿前后或左右方向移动距离超过探头半径,底波幅度降低或消失,密集圈面积大于生产截面;若底波幅度恢复到原有高度,则密集圈面积小于生产面积。​

质量评级​

缺陷面积小于声场截面积:已知缺陷回波与基准平底孔波幅的 DB 差值,利用不同公式计算缺陷当量直径,最终用 Φ 4 加减多少来表示,再依据标准进行质量评级。​

缺陷面积大于声场截面积:分别计算缺陷面积与被检锻件的面积,得出比值后查标准进行质量评级。​

缺陷引起底波降低量:依据底波降低量对锻件进行质量评级,通过比较无缺陷处和有缺陷处底波占满屏高度的百分比,查标准进行质量统计。​

特殊缺陷评级:锻件中出现折叠、白点、空心、裂纹缺陷,直接评为最差。

铸件探伤​

铸件与锻件的区别​

试块不同:铸件和锻件的声学性能不同,常用的 CSK-1、CS - 2 系列、CS - 3 系列试块不能用于检测铸件。​

材质特性:铸钢和铸铁的主要区别在于碳含量,铸铁碳含量高于 2%,铸钢碳含量低于 2%。铸钢强度和韧性较高,具有优良的塑性和焊接性;铸铁耐磨性和抗压强度较高,但抗拉强度较低。​

铸件特点及常见缺陷​

组织不均匀:铸件组织不均匀,靠近模壁晶粒细小,远离模壁形成柱状晶,中心部位为等轴晶体,这会影响超声波探伤的缺陷定位。​

组织不致密:铸件以树枝状生长,树枝间液态金属难以充满,且冷却凝固时体积收缩,易形成缩孔和疏松。​

表面粗糙:铸件一次浇注成型,形状复杂,表面硬度大,难以加工,不符合超声波探伤的耦合条件。​

常见缺陷:铸件中主要缺陷有缩孔、疏松、气孔、夹渣、冷裂纹、热处理裂纹、白点、冷隔等,其中冷隔是铸件特有的缺陷,危害性较大。​

铸件检测特点​

超声波穿透性能差:铸件中粗大的晶粒、不均匀的组织和粗糙的表面使超声散射增大,声能损失严重,可焊厚度小。​

声耦合差:铸件表面粗糙,机加工困难,声耦合差,检测时常用高浓度的耦合剂,如黄油。​

干扰信号多:铸件组织不致密、不均匀,晶粒粗大,会产生草状波信号,粗糙表面会形成杂波信号,形状复杂易产生几何反射回波和磁道回波,妨碍缺陷信号识别。​

缺陷检测要求低:铸件中一般允许存在的缺陷尺寸较大,数量可较多,工艺性检测只要求检出危险性缺陷。​

铸钢件超声检测方法​

纵波单晶直探头检测:适用于检测厚度大于 45 毫米、表面比较光滑的铸件,可采用距离波幅曲线法或 AVG 曲线法检测。​

纵波双晶直探头检测:适用于检测厚度小于 45 毫米的铸件,可采用距离波幅曲线法检测。​

纵波单晶斜探头检测:用于检测裂纹缺陷或无法采用纵波直探头检测的部位,需做距离波幅曲线,采用低频单晶纵波窄脉冲探伤。​

分层检测法:对于厚度特别大的铸件,采用分层检测法,将铸件厚度分为若干层,每层分别采用该层的灵敏度进行检测。检测系统调整时需做试块,根据试块调整扫描基线和灵敏度余量。

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  1. CONNECT:[ UseTime:0.000871s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001371s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000632s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000628s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001322s ]
  6. SELECT * FROM `set` [ RunTime:0.000602s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001560s ]
  8. SELECT * FROM `article` WHERE `id` = 486850 LIMIT 1 [ RunTime:0.001078s ]
  9. UPDATE `article` SET `lasttime` = 1778225651 WHERE `id` = 486850 [ RunTime:0.002953s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000728s ]
  11. SELECT * FROM `article` WHERE `id` < 486850 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.010780s ]
  12. SELECT * FROM `article` WHERE `id` > 486850 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002694s ]
  13. SELECT * FROM `article` WHERE `id` < 486850 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.026017s ]
  14. SELECT * FROM `article` WHERE `id` < 486850 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002369s ]
  15. SELECT * FROM `article` WHERE `id` < 486850 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006340s ]
0.148568s