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首页> 外文期刊>Philosophical magazine: structure and properties of condensed matter >On the development of a new pre-weld thermal treatment procedure for preventing heat-affected zone (HAZ) liquation cracking in nickel-base IN 738 superalloy
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On the development of a new pre-weld thermal treatment procedure for preventing heat-affected zone (HAZ) liquation cracking in nickel-base IN 738 superalloy

机译：关于开发一种新的预焊接热处理工艺以防止镍基IN 738高温合金的热影响区（HAZ）液化开裂的研究

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摘要

Hot cracking in the heat-affected zone (HAZ) of precipitation strengthened nickel-base superalloys, such as IN 738, during fusion welding remains a major factor limiting reparability of nickel-base gas turbine components. The problem of HAZ intergranular cracking can be addressed by modifying the microstructure of the pre-weld material through thermal treatment, which requires significant understanding of the critical factors controlling cracking behaviour. The decomposition of Mo-Cr-W-and Cr-rich borides in the alloy, among other factors, has been observed to contribute significantly to non-equilibrium intergranular liquation and, hence, intergranular liquation cracking during welding. Gleeble physical simulation of HAZ microstructure has also shown that non-equilibrium liquation is more severe in the vicinity of decomposed borides in the alloy and can occur at temperatures as low as 1,150 °C. Although currently existing pre-weld heat treatments for IN 738 superalloy minimize the contributions of dissolution of second phases, including borides, to HAZ intergranular liquation, these heat treatments are not industrially feasible due to process-related difficulties. Therefore, a new industrially feasible and effective pre-weld thermal treatment process, designated as FUMT, was developed during the present research by controlling both the formation of borides and the segregation of boron at the grain boundaries in the pre-weld heat-treated material. This thermal treatment was observed to very significantly reduce intergranular HAZ cracking in welded IN 738 superalloy. The details of the development process and developed procedure are presented in this paper.
机译：在熔焊过程中，析出强化的镍基高温合金（如IN 738）在热影响区（HAZ）上的热裂纹仍然是限制镍基燃气轮机部件可修复性的主要因素。 HAZ晶间裂纹问题可以通过热处理改变预焊材料的微观结构来解决，这需要对控制裂纹行为的关键因素有深入的了解。除其他因素外，已观察到合金中Mo-Cr-W-和富含Cr的硼化物的分解对非平衡晶间液化和焊接过程中的晶间液化开裂有显着影响。对HAZ微观结构的灵巧物理模拟还表明，合金中分解的硼化物附近的非平衡液化更为严重，并且可能在低至1,150°C的温度下发生。尽管当前对IN 738高温合金进行的预焊接热处理使包括硼化物在内的第二相的溶解对HAZ晶间液化的贡献最小化，但是由于与工艺相关的困难，这些热处理在工业上不可行。因此，在本研究中，通过控制预焊接热处理材料中硼化物的形成和晶界处硼的偏析，开发了一种新的工业上可行且有效的预焊接热处理工艺，称为FUMT。 。观察到这种热处理可以显着减少焊接的IN 738合金的晶界热影响区裂纹。本文介绍了开发过程和开发过程的详细信息。

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