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Tham khảo tài liệu 'handbook fractography (1998) ww part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | c_I 3.3 Um Fig. 566 Higher-magnification view of the area within the rectangle in Fig. 565 which reveals additional small dimples that are not readily apparent at the lower magnification. See Fig. 567 568 and 569 for the effects of tempering on the fracture surface. SEM 3000 Fig. 567 Charpy I mpact fracture in a specimen of the same alloy steel and given the same austenizing treatment as in Fig. 564 but then te mpered for 1 h at 600 1110 F which maximized secondary hardening and air cooled. See also Fig. 568. SEM 3000 Fig. 568 An enlargement of the area in the rectangle in Fig. 567 . This specimen which had the same yield strength as that of the as-quenched specimen in Fig. 564 fractured mainly by intergranular separation. See Fig. 569 for a higher-magnification view of the area in the rectangle here. SEM 10000 Fig. 569 Higher-magnification view of the area in the rectangle in Fig. 568. A tongue- like formation is visible at left center on the flat surface of a grain. Tempering has produ ced embrittling networks of carbide particles. SEM .
