32 2 2008 2 Materials for Mechanical Engineering Vol. 32 No. 2 Feb. 2008,, (,, 116024) : ;, : ; B7, - 55, 568,700 MPa 22. 0 %, 21. 5 %,615,675 MPa 24. 4 %,22. 0 % ; : ; ; : U213. 5 ; U214 : A : 100023738 (2008) 0220049204 Perf ormance Evaluation of Two Ne w Types of Fishplate Materials Used f or High2speed Rail way WEN Kai, XU Fu2min, TAN Yi (Dalian U niver sit y of Technology, Dalian 116024, China) Abstract : According to the state standard, comparative studies were made on the tensile property and impact property of two types of new fishplate materials made both in China and Germany at room temperature and low temperature. The images of tensile f racture and impact f racture at various temperatures were observed with SEM. The modes of cracking are discussed. The result s indicate that the two types of materials are low alloy steels. At room and low temperature, the tensile and impact properties of these two materials are superior to the B7 steel used at present in China and the fishplate material made in Japan. Under the condition of room temperature and - 55, the yield strength and elongation of domestic material respectively were 568 MPa, 700 MPa, 22. 0 %, 21. 5 %, while tho se of Germany material respectively were 615 MPa, 675 MPa, 24. 4 %, 22. 0 %. properties of the fishplate material made in Germany is more stable than that made in China. Key words : fishplate material ; mechanical property ; f racture analysis In addition, the mechanical 0,,,,,, [1 ],, ; :2007204217 ; :2007205220 : (J H01-071) : (1983 - ),,, :,,,, [2 ],,,,20 90, [ 3,4 ], 1 1. 1 ( A) ( B) d0 = 10 mm 49
,: L 0 = 5 d0 ; V, 10 mm 10 mm 55 mm 1. 2 CS2344 ; HB23000 ; MeF3 ;CFF2220 GB 228-1987,22 ( ),0, - 20, - 40, - 55,3 ;GB230B GB 229-1984, 22 ( ),0, - 5, - 10, - 13, - 15, - 20, - 30, - 45, - 60 J SM25600LV (SEM) ( a) A 2 2. 1 1, A B ; A B, B, [5 ] 1 A B( / %) Tab. 1 Chemical composition of f ishplate materials A and B( mass/ %) C Si Mn Cr P Ni Cu S V A 0. 10 0. 461 1. 528 0. 377-0. 048 0. 177 0. 001 - B 0. 23 0. 252 1. 184 0. 082 0. 008 0. 075 0. 286 0. 014 0. 051 ( b) B 1 A B Fig. 1 Microstructure of fishplate materials A and B A B, A B,, A B 2. 4 A B,A B, B7, 2 [2,7 ] 2. 2 1, A [6 ], 8. 91m, 4. 62m ; B,, 16. 5m, 18. 15m ; A B 2. 3, TB/ T 2345-19934375 kg m - 1 B7 230390 HB A 254 HB,,B 228. 3 HB, ; A B 26 HB 2 A B B7 2 Fig. 2 Contrast f igure of impact properties of materials A, B, B7 and Japanese fishplate at various temperatures 0. 4 A kv ( ) [8 ],A - 10,B - 50 A 102 J, B ;,A,- 10 B A B 50
,: B7 3, A,- 50, 4, B, - 50 3 4, A B,2, B ( a) 22 ( b) - 20 ( c) - 50 3 A SEM Fig. 3 SEM micrographs of impact fractures of material A at various temperatures ( a) 22 ( b) - 20 ( c) - 50 4 B SEM Fig. 4 SEM micrographs of impact fractures of material B at various temperatures 2. 5 (1) 2, A B, A 0. 66, B 0. 77,, [9 ] A B 2 Tab. 2 Data of the tensile properties of f ishplate materials at room temperature / MPa / MPa / % B7 780 520 9 20 845 530 10 30 / % A 857 568 22. 0 63. 5 B 801 615 24. 4 66. 2 (2) 5,, A B,,,, [10 ] ;,, (3) SEM 6,22,,,- 55, 7,22,,,,A, B A 51
,: 3 5 A B 2 Fig. 5 The tensile properties of materials A and B changing with the test temperatures (1) A B,A,B,;A B (2) A B B7, 2, ;, (3) A 100 J,,, - 60 11 J ; B 32 J,,; A B B7 (4) A B, ( a) 22 ( b) - 20 ( c) - 55 6 A SEM Fig. 6 SEM micrographs of tensile fractures of material A at various temperatures ( a) 22 ( b) - 20 ( c) - 55 7 B SEM Fig. 7 SEM micrographs of tensile fractures of material B at various temperatures : [ 1 ],,,. [J ].,2004 (3) :161-167. [ 2 ],,. [J ].,1995 (2) :182-187. [ 3 ],,,. [J ].,1998 (6) :1-7. [ 4 ],,,. [J ].,2005 (3) :35-39. [ 5 ],,. [ M ]. :,2005. [ 6 ],. [J ].,2002 (1) :61-67. (56 ) 52
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