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Rare earth and titanium steel, variable quality of ZG55 Experimental Study on Treatment


; 0. A pair of 9mm, the thickness of 10 ± 0.05ram wear test conditions for the applied load 490N, speed 200r/rain, and to 2O No. oil as lubricant. Pre-test prior to running 2h, 40h and then for the running test. Using electro-optical analytical balance weighing, the test results in Table 4. Can be seen from Table 4, the RE treated ZG55 steel samples, the wear resistance of 2.89 times that of conventional steel, while the RE-T treated steel is 4.40 times the untreated steel, showing that RE treatment resistance of the steel mill was improved significantly,[link widoczny dla zalogowanych], and by the RE-Ti steel wear resistance at Table 4 Test results ZG55 pre-heat treatment of steel mill grinding station 4oh 2h weighed weighing wear after wear treatment conditions relative to conventional treatment is normalizing l376842】 85RE Fire】 37 {356] 374292RE a deal with normalizing l37.56l {1l3755894.2 rj management to improve the wear resistance of steel even larger. This is RE, Ti of the fine grain strengthening effect and to reduce and improve the shape and distribution of inclusions on. 6 different treatments on the properties of steel casting liquid steel by 6.1 of a 15011 ZLL concentric three-helix-type alloy flow analysis (consistent with JB / Z standard),[link widoczny dla zalogowanych], test results in Table 5. Table 5 tests the mobility data ZG steel steel pouring temperature / mold conditions, the average flow length / wet processing conditions, type 6883RE conventional quartz sand quartz sand processing】 j50 wet type processing】 720780,8307767 RE-TL Type l005 550 wet sand , l030, l090l0417 No. 6 Qinzi Rui et al: rare earth and titanium steel Modification of ZG55 Experimental Research 27, Table 5 shows, ZG55 steel after RE treatment and RE_ri complex modification, the steel is significantly improved liquidity, after adding _rj can further improve the liquidity of steel. The reason for the amount of RE with the oxygen to sulfur, clean steel melt, help to improve the mobility of steel. The _rj and oxygen also have a strong binding capacity, it added enhanced deoxidation of steel capacity, can take advantage of RE in the desulfurization and modification effect of inclusions:. 6.2 Performance test of steel steel thermal cracking tendency of hot cracking test using test bar ZqS2000 dual line thermal shrinkage cracking device,[link widoczny dla zalogowanych], test results in Table 6. Table 6 tests the hot tearing tendency of steel and linear shrinkage ZG55 steel pouring temperature / hot crack hot crack temperature / thermal cracking force / linear shrinkage,[link widoczny dla zalogowanych], treatment conditions the shape of small hard-General 1550 N 1550 Xi crack crack dealing was 1410RE destroyed 135016ORE-TI Implicit processing 155O seen from Table 6 crack 1300175, conventional ZG55 steel was hot crack, RE RE treated by only a slight crack of steel, but by RE - Ti complex modification of the steel occurs only the naked eye can not see the hidden cracks. Pyrolysis temperature and thermal crack force modification of steel were also lower than the untreated steel, and increased that of rare earth complex modification of the thermal cracking of steel significantly improved performance. This is due to a _ri RE purification of liquid steel and the inclusion modification and refinement of the organization to improve high temperature strength of steel and plastic toughness, so that the hot tearing tendency of steel decreases. 7 Conclusion (1) The RE and the combined treatment can refine ZG55 RE_rj cast, and it was fine,[link widoczny dla zalogowanych], and normalized tissue homogenization. (2) modification, can reduce the number of inclusions in steel and make it into a mixture of globular RE-Os, was diffuse and uniform distribution. (3) RE and RE - Ti two kinds of modification can obviously improve the mechanical properties of steel and Wear (4) modification can significantly improve the flow of steel, and thermal crack resistance and little change in linear shrinkage, improve the casting properties with good results. References _】] Qin Zirui and so on. 1989, new technology and new technology. <2): 7 ~ 9 [2] SimsCE. AIMETransactions. 1959, (215): 367 ~ 376 \1998 price 8.00 yuan each, the annual subscription fee 48.00 yuan, welcome domestic and foreign readers and subscribers around the post office or to the China International Book Trading Corporation (jB Beijing 399 mailbox) subscription. Domestic Mail subscription code 32-53, the foreign subscription code BM4155, who subscribe to remote areas have difficulties due to the post office and other causes leak or need updating set of readers and subscribers directly to the 1118 Ding Xi Road, Shanghai (Postal Code 200050), \metal \
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