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Cracking Analysis of Economizer Tube

The outer surface of the joint area. Pipe band structure because of serious banded ferrite and pearlite in the tensile stress, the soft phase ferrite first deformation, the ferrite incompatible with adjacent tissue deformation, and thus vulnerable to the phase boundary by the straight through crack initiation and ferrite. If the band structure into the weld heat affected zone,[link widoczny dla zalogowanych], and under compression to squeeze into the welding seam, and surface outcrops in the pipe, the weld toughness is low; the contrary does not exist if the band structure near the weld in the base metal there were serious band structure at the base metal toughness is low. Therefore, after the crack under pressure in the pipe, then along the direction parallel to the rapid expansion of banded to form a straight brittle fracture. 4 Conclusions and recommendations (1) of the tube cracking due to heat generated in high temperature and pressure, the crack source in the plastic produce poor weld fusion zone and band structure along the parallel rapid expansion, the formation of cracks. (Continued on page 275) Cao Yongming such as: ion secondary ion mass spectrometry and its application schematic diagram 6RAE quadrupole mass spectrometer and electron multiplier detection system. Secondary ion mass spectrometry (SIMS) is used by the primary ion beam bombardment sputtering out of the sample contains information on the sample components as the ion source of secondary ion, the ion detection system has a Faraday cup, electron multiplier,[link widoczny dla zalogowanych], double (on the next p. 256) (2) weld fusion zone widmanstatten serious proposals to improve welding process, change for the multi-layer welding or soldering normalizing treatment after welding to improve the weld properties. (3) of the pipe band organization seriously, it is recommended to strengthen the material with the same tube to monitor all such pipes, if necessary, replaced. References: [1] Wu Fei Wen. Power plants running hot metal [M]. Beijing: China Water Power Press ,1979.171-173. [2] Tian Xi Tang. Welded I-M]. Beijing: Mechanical Industry Press ,1994.72-73. [3] Zhu Dunlun. Failure Analysis of Mechanical Parts I-M]. Xuzhou: China University of Mining Press ,1993.61 - 62. [4] Wang Wen silver. Banded of pipe weld strength and toughness [J]. Pipe, 1998,21 (5): 16. [5] Chen Nanping. Mechanical parts failure analysis [M]. Beijing: Tsinghua University Press ,1988.366-367. Liquid metal and nonmetal surface bright light this new liquid surface, the use of film-forming agent, brightener, preservative compound from surface treatment of the required materials (iron, molybdenum, aluminum and other metal or non-metallic) to oil, rust and placed in the liquid, after 60rain treatment, bright as a mirror to the decorative effect and to maintain the mechanical properties of raw materials. Cost is only stainless steel 1 / 4. Quoted in \For example, the French company's IMS CAMECA SIMS uses a series of double-focusing magnetic mass spectrometer, produced by the United States is used in TOF-SIMS Time of Flight mass spectrometer, while the German company's SIMS is ATOMECA quadrupole mass spectrometer used to choose different The mass spectrometer and by mass spectrometry ion source needs and production costs and other factors. However, as ion detection system, plate,[link widoczny dla zalogowanych], electronic detection system will be completely replaced. For example, to trace and depth distribution of micro three-dimensional analysis, you must use the IMS-6F-based SIMS. However, if the group of surface contamination of organic macromolecules, the company is the strength of TOF-SIMS, secondary ion mass spectrometry ion source of the nature of their work in the quantitative analysis of the inadequacies. Of gas and liquid samples can be analyzed by ICP-MS. (Continued) (Continued from p. 267) after a relatively slow rate of cooling,[link widoczny dla zalogowanych], often along the grain boundaries of secondary cementite. Rod caused by inhomogeneity of the reason is probably spinning rod cooling after the poor, and some local rod stacked too close, the rod overlap at high temperature, cooling rate is slow, so that austenite cementite along the grain boundaries too early, the longer the stay the more cementite precipitation. 4 Conclusion (1) lead to 8O steel wire rod drawing process is the direct cause brittle inhomogeneity rod, a large network of secondary cementite in austenite grain boundaries. (2) strict control of the finish rolling temperature and increasing the cooling rate, can reduce or avoid the network of secondary cementite precipitation in the austenite grain boundaries. References: [1] Ma Si-Chun. Materials science [M]. Xi'an: Shaanxi Science and Technology Press, 1998. [2] Wei full payment. Materials Electron Microscopy I-M]. Beijing: Metallurgical Industry Press, 1990. [3] Wu Zhongxuan. Problems of uneven performance steel [J]. Metal products, 1991,[link widoczny dla zalogowanych],25 (1): 12 ~】 5.

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