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 Wysłany: Sob 3:00, 08 Sty 2011 Temat postu: air jordans Metal casting high chromium cast iron |
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Metal casting high chromium cast iron grinding ball complex modification of
Cut anti-Western film thickness l0mm to detect the points on the ball cross-section hardness, heat, Dan cut from the wafer cut 10l0 × 55 (ram) details the impact test, phase test fish samples for testing collision wear. Bustard wear test cup-type wear in self-test machine. Section 150 of silicon carbide grinding operation for the Matte paper, pressing weight of ION. Wear time 3mh. To QT50o - 5,, ~ J 'material loss of weight and calculation of grinding ball's moving on wear resistance. 3 Test results and analysis within the macro can now end on 31 May and the results of phase analysis of box center of the ball slide to observe the macro-structure after the cut,[link widoczny dla zalogowanych], all by the deterioration and the internal organization is not caused by deterioration of the ball Luan, without Shrinkage and other casting defects. Can be seen in the experimental composition range of domestic metal type + insulation to take [1,[link widoczny dla zalogowanych], then made to ensure the process has taught high chromium iron ball of Prayer Prayer quality made men, j4 things. Research relies on plug lecturer left to save. i thermal processing '5 / 1996 ⑦ one volume. Disk phase analysis showed that for the cast: austenite + eutectic carbides after a quenching treatment organizations: martensite, eutectic carbides (MC, type) + + Eph proud little residual secondary carbides austenite (Figure 2). The ball without modification of primary austenite dendrite organization coarse eutectic carbide size larger, elongated strip, plate and mesh distributed off-obvious austenite dendrites (Fig. 2a) I through RE, V, Ti complex modification, the primary austenite dendrites is obviously fine, dendrite arm spacing, eutectic carbide morphology and distribution of improved significantly. Size decreases, network carbide disappeared, and the emergence of the worm-like conglomeration of carbide (Fig. 2b) for a while by Re, B, Ti, V complex modification, the ball further refine the organization of eutectic carbides and massive increase in carbides (Fig. 2c). (A) did not Modification 400 × (b) RE, Vn League table modification 400 × (c) RE, V, TjB Recovering bad ball 400 × Figure 2 panel cupboard after quenching cross section of tissue 3.2 ■ ball quenching hardness distribution ball cross section after the hardness distribution shown in Figure 3. (A) to change Ha (b) Re, V, Tj metamorphic (c) Re,[link widoczny dla zalogowanych], V,, B Zhang offend few metamorphic field 3 on the hardness profile after the fire (HRC) distribution can be seen, the modification slightly after the ball hardness deterioration of the ball higher than the hardness, and by modification after the ball center and the small difference between the surface hardness and hardness distribution. This is to ensure the ball throughout the wear resistance of the favorable conditions. 3.3 ■ One set the ball on impact toughness of the impact test results (Table 1) visible. The modification of the impact toughness after the ball was significantly pricey,[link widoczny dla zalogowanych], its cone impact of state and heat treatment were higher than not bad ball, and the RE, V, Ti, B complex modification technology platform results significantly. This was mainly due to bad treatment makes Moqiu organization austenite Xihua improved eutectic carbide morphology and distribution, carbide size decreased level of isolation and other factors which led to Moqiu improve material change in fracture mechanism , an increase of crack transgranular fracture on the route, leaving the mechanism of intergranular fracture decreased. Wrapped in an impact test results (Jm) 3.4 ■ One of the quality on the impact of resistance to the wear test results (Table 2) shows that complex modification by thermal processing '5 t / 1996, the ball of the ground lost weight reduction to RE, V, Ti, B complex modification of ball wear the smallest,[link widoczny dla zalogowanych], the highest relative wear resistance. This was mainly due to bad elements V,, B can form the distribution of high hardness carbide particles Mi King, and the deterioration that eutectic carbide refinement, to reduce the mean free path. Protective effect of the substrate to enhance the combined result of such factors. Table 2 Wear test results millet 4 conclusions. (1) type of metal casting technology + high riser chrome 'll \cast iron ball in the high lead carbide morphology and distribution of its mass, evenly distributed. size decreases. (3) complex modification of the high chromium cast iron ball significantly increased the impact toughness, while the hardness increased slightly, uniform hardness with good wear resistance also increased. Reference i Zhang Hui and so on. metamorphic high-Jones and properties of cast iron cast removal, l998 ( : 7 ~ IO2 Yu Xu as such. to improve the high chromium cast iron impact toughness. Modern Cast Iron, 1989'3): 3 ~ 3 Wang did so. for mining troostite transferrin high chromium grinding balls. foundry, 199i (1o): 27 ~ 3o4 Yingjie and so on. grinding drum of the case back together loss . Beijing Machine Building Industry Press, I988 closing prayer Date: April 12, 1996
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