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本文对K18合金等温凝固扩散焊接的工艺及元素的扩散行为进行了研究。采用等温凝固扩散焊工艺,解决了铸造高温合金熔化焊时产生热裂纹的问题。对元素的扩散现象,特别是硼的扩散现象进行了X 射线分析和金相检验,进一步证实了以M_3B_2型存在的硼化物促进了(?)相的形成.影响K18合金扩散过程的关键是控制硼的扩散.试验证明.只是在等温凝固扩散焊接过程的后期,硼的扩散才比较接近Fick 定律.等温凝固扩散焊对不易熔焊的高温合金提供了可靠的焊接方法.它不但可焊同种材料,还可焊异种材料.
In this paper, the process of isothermal solidification and diffusion welding of K18 alloy and the diffusion behavior of the elements were studied. The isothermal coagulation diffusion welding process solves the problem of hot cracking in the welding of the foundry superalloy. X-ray analysis and metallographic examination of elemental diffusion phenomena, especially boron diffusion phenomena, further confirmed that the formation of the (?) Phase was promoted by the presence of the boride species M_3B_2.The key to influencing the diffusion process of K18 alloy was control Boron diffusion test proved that only in the late stage of isothermal solidification and diffusion welding process, boron diffusion is relatively close to Fick’s law isothermal solidification diffusion welding not easy to weld high-temperature alloys provide a reliable welding method not only welding the same species Materials, but also welding dissimilar materials.