This standard specifies the metallographic sampling, alloy structure evaluation method and grade diagram of tin-based bearing alloys. CB 1156-1992 Metallographic Examination of Tin-Based Bearing Alloys CB1156-1992 Standard Download Decompression Password: www.bzxz.net

Shipbuilding Industry Standard of the People's Republic of China
CB 1156—92
Metallographic Inspection of Tin-Based Bearing Alloys
Published on July 4, 1992
China State Shipbuilding Corporation
Implemented on February 1, 1993
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This standard specifies the metallographic sampling, alloy structure evaluation method and grade diagram of tin-based bearing alloy bushings. CB1156-92
Classification number: U05
Replaces (B1156
This standard is applicable to the metallographic inspection of various types of bearing bushes cast by ChSnSb11-6 and ChSnSb7.5-3 for main and auxiliary marine engines. 2 Metallographic sampling
2.1 The metallographic specimen is taken from a furnace ingot with a size of 40mm×40mm×10mm, or it can be cut from the unstressed part of the bushing. The specimen thickness is The bottom plate surface of the bearing must be touched, and the deformation layer should be removed for various sampling. 2.2 The grinding surface for metallographic inspection should be the thickness section of the ingot cut along the center and the thickness section cut from the rough surface of the bearing. 3 Alloy structure evaluation
3.1 The phase composition of ChSnSb11-6 alloy is α phase, β phase and ε phase, and the phase composition of ChSnSb7.5-3 alloy is α phase and ε phase. 3.2 After the sample is etched with 4% nitric acid alcohol solution, it is observed under a microscope with a magnification of 100 times. 3.3 The entire grinding surface must be observed during inspection.
3.4 ​​The main To check the side length and segregation degree of β phase, ChSnSb7.5-3 alloy mainly checks the line length of the phase. 3.5 When evaluating the organization, the side length of β phase and the line length of e phase shall be based on the majority of the visual field. If there are two levels of evaluation results, two levels can be used to represent it, and the dominant level is marked with a horizontal line under the level number, such as 3/4 or 2/3. Alloy organization classification
4.1 The side length of β phase is divided into 5 levels, and it is evaluated according to Table 1 and Figures 1 to 5. Table 1
China Shipbuilding Industry Corporation approved the side length of B phase on July 4, 1992, mm
>4. 0~8. 0
>10~15
1993-02-01 implementation
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Figure 1β phase 1 level
Figure 3β phase 3 level
CB115692
Figure 5β phase 5 level
4.2β phase shape and distribution are divided into 5 levels, which are evaluated according to Table 2 and Figures 6~10. Figure 23 Phase 2 level
Figure 4B Phase 4 level
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CB1156---92
β phase shape and distribution description
β phase is square with small overlapping distribution, which is still uniform.β phase is square and small irregular distribution.β phase segregation is more serious
β phase is large overlapping distribution
β phase Irregular and disorderly distribution
Figure 61 level
Figure 83 level
Figure 72 level
Figure 94 level
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CB1156-92
Figure 105 level
4.3e The phase line length is divided into 5 levels, which are evaluated according to Table 3 and Figures 11 to 15. Table 3
Figure 11e phase 1 level
e phase line length, mm
>10~15
Figure 12e phase 2 level
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CB1156—92
Figure 15ε phase 5 level
Figure 14E phase 4 levelwww.bzxz.net
Additional instructions:
This standard is proposed by the Marine Material Application Technology Sub-Technical Committee of the National Marine Ship Standardization Committee. This standard is under the jurisdiction of the 725th Institute of China State Shipbuilding Corporation. This standard is drafted by Hudong Shipyard, Shanghai Shipyard and the 12th Institute. The main drafters of this standard are Tang Weicheng, Chen Xuexian, Gong Kunlong, Zhang Yan and Xu Caidi. Standard information collector www.17bzw.cn Yiqi Standard Network provides free download of 100,000 standard books and information. If you know how to type, you can quickly build a website in 5 minutes www.17jzw.com Yiqi Website Building Network provides free website building platform, commercial website only 60 yuan a year w.3x888.co
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