CAJ | 학술논문

Ti-2 Al-2.5 Zr合金焊丝的低倍组织中普遍存在细小坑痕形貌。为判定焊丝坑痕的缺陷性质，通过对显微组织和能谱成分的综合分析，初步判断钛合金焊丝低倍组织中出现的细小坑痕为金相腐蚀造成的腐蚀坑，再通过观察不同腐蚀时间的显微组织发现坑痕直径随着金相腐蚀时间增加而不断变大，从而验证了低倍坑痕为金相检验过程中的点腐蚀所致。 Ti-2 Al-2.5 Zr合金铸锭制备过程中不可避免地存在微区成分的差异，加上热加工过程中动态再结晶对成分的再分配效应，引发了材料局部微区成分及组织不均匀，这是金相腐蚀后呈现坑痕形貌的原因。由此可见，低倍组织中的腐蚀坑痕不属于冶金缺陷，不会影响钛合金焊丝的整体冶金质量和性能水平。
Ti-2 Al-2.5 Zr합금한사적저배조직중보편존재세소갱흔형모。위판정한사갱흔적결함성질，통과대현미조직화능보성분적종합분석，초보판단태합금한사저배조직중출현적세소갱흔위금상부식조성적부식갱，재통과관찰불동부식시간적현미조직발현갱흔직경수착금상부식시간증가이불단변대，종이험증료저배갱흔위금상검험과정중적점부식소치。 Ti-2 Al-2.5 Zr합금주정제비과정중불가피면지존재미구성분적차이，가상열가공과정중동태재결정대성분적재분배효응，인발료재료국부미구성분급조직불균균，저시금상부식후정현갱흔형모적원인。유차가견，저배조직중적부식갱흔불속우야금결함，불회영향태합금한사적정체야금질량화성능수평。
It was found that some imperceptible spots usually appear in macroscopic examination of Ti -2Al-2.5Zr alloy welding wire .In order to determine the nature of the defects of the welding wire , microstructure observation and energy spectroscopic analysis were carried out , and it was preliminary judged that fine spots in the macrostructure of titanium alloy welding wire were etch pit .After corrosion in metallurgical corrosion solution , it was found that spot diameter became larger with increase of etching period , which confirmed that spots were pitting .This redistribution of constitute is inevitable during melting of Ti-2 Al-2.5 Zr alloy ingot , combine with redistribution effect of dynamic recrystallization on the composition of the components during hot working , the appearances of spots in macrostructure are normal phenomena and not harmful to integral alloy quality and solder wire performance .