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Die 60Si2Mn comparative study of steel and Toughening Process


Toughening mechanism is more after high temperature quenching residual austenite, while in deep cryogenic treatment process will take a certain amount of residual austenite into martensite, retained austenite reduced the role of useful toughening . Similarly, 60Si2Mn quenched steel after quenching at room temperature has more carbon in the martensite and austenite during quenching high temperature more uniform carbon content, the organization received more quenched martensite, so the process of deep cryogenic treatment ,[link widoczny dla zalogowanych], the conventional quenching a large number of dispersed carbide precipitates more easily, so that cryogenic treatment after quenching at room temperature for better strength and toughness. Experimental data from Table 2 also shows that deep cryogenic treatment after conventional quenching process (Process 3) high-temperature strength and toughness than quenching (T Art 2). Because high-temperature quenching toughening Although many factors, but there are also negative factors of grain growth, while the conventional cryogenic treatment after quenching there is no performance disadvantage. Therefore, under the condition of process equipment allowed, 60Si2Mn Die steel cryogenic treatment can be conventional quenching T arts to improve strength and toughness and die life. Should be noted that the use of liquid nitrogen cryogenic treatment media do not have to use high purity liquid nitrogen, generally when the factory oxygen plant oxygen nitrogen Dumping waste collected for immediate use. Thus, the conventional quenching T cryogenic treatment temperature quenching arts are more energy-saving effect. Cryogenic treatment on the length of time after cryogenic treatment performance have been inconclusive. Different studies, different kinds of steel have different conclusions. In this paper, long 60Si2Mn steel cryogenic treatment did not achieve better results. The best time to be cryogenic treatment depth. 3 Conclusions (1) 60Si2Mn Die quenching of steel with high temperature can improve the flexural strength of 2.5, the impact toughness increased by 14.3, a corresponding increase in wear resistance. Toughening effect certain. (2) 60Si2Mn Die steel after conventional quenching and cryogenic treatment can improve the bending strength of 12.8,[link widoczny dla zalogowanych], the impact toughness increased to 53.3, while the relative wear resistance of the 219 / 5, better than the Toughening high-temperature quenching. References: [1] Chen Yunbo. The basic properties of cold die steel toughening heat treatment T Art [J]. Heat Treatment of Metals, 1982, (9) :45-48. [2] Li Chunxin. Austenitizing temperature on martensitic steel 60Si2Mn morphology and properties of [J]. Heat Treatment of Metals, 1985, (4) :3-7. [3] CHEN Ding, Huang Peiyun, Li literature. The development of cryogenic treatment of metal profiles [J]. Thermal processing technology, 2001,[link widoczny dla zalogowanych], (4) :57-59. Tin (Continued from page 39) modifier, the composite modification effect modifier best reflect the various components of both the advantages and overcome certain components of its adverse effects 0.15 Yun Mao is increase in chromium cast-hsiang. Overall performance of the optimal iron modifier. Shirt ...: Table 2 Comparison of Mechanical Properties of various metamorphic processes Lan 0.51.01.52.0 hardness modifier type rare earth ferrosilicon export K/J-cm5.55.66.15.3 HRC5252.253.953.5 hardness of low carbon ferrochrome export K/J-cm5.55.86.16.5 HRC51.752.553.253.7 hardness HRC52.452.653.954.3 compound modifier mouth K/J-cm5.66. 16.46.7 Table 3 a variety of metamorphic processes on the matrix spacing of modifier modifier addition of 0.5 volume of 1.5 by adding spacing / p. m matrix spacing / \}____ States mouth mouth 0.5% 1.O% 1.5% 2.O% 05% 1.O% 1.5% 2.O% 0.5% 1O% 15% 2.O% low carbon ferrochrome rare earth ferrosilicon modifier modifier modifier compound Figure 12 Modification Process on the Wear Resistance of Reference: [1] Chen, Lee See-Young, Shu convincing,[link widoczny dla zalogowanych], and so on. of chromium cast iron modifier selection and its effect organizations,[link widoczny dla zalogowanych], the impact wear resistance [J]. casting technology, 1997, (3) :20-23. '[2] process must Wai, Su Yunbiao, Zhang Yun Korean. high carbon chromium steel ball in the Study Liner [A ]. Seventh National Conference of metal wear-resistant materials Selected Papers [(,]. 1996.2731. [3] Liu Bing, power meters, just once. trace Alloys with low chromium cast iron ball trial [J]. thermal processing technology, 1997, (2) :40-42. [4] HAN Fu-sheng, Zhang Qi, Guide You, et al. low chromium white cast iron grinding ball and Properties of [J]. foundry, 199,346) :16-20 . TIAN

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