钛工业进展
鈦工業進展
태공업진전
Titanium Industry Progress
2015年
5期
34-37
,共4页
王海%魏芬绒%崔文俊%樊亚军%陈志宏%朱峰
王海%魏芬絨%崔文俊%樊亞軍%陳誌宏%硃峰
왕해%위분융%최문준%번아군%진지굉%주봉
Gr2纯钛%点状缺陷%电子探针显微分析%显微硬度
Gr2純鈦%點狀缺陷%電子探針顯微分析%顯微硬度
Gr2순태%점상결함%전자탐침현미분석%현미경도
Gr2 pure titanium%point-like defects%Electron Probe Micro-analyzer%microhardness
对用来加工手表盖的Gr2纯钛棒材生产过程中发现的端面点状缺陷进行了分析,通过对典型缺陷的显微组织及硬度进行检测,发现缺陷处晶粒更加细小,呈条带状,且显微硬度高于基体;对缺陷区域进行能谱分析,未发现明显的成分差异;最后对缺陷区域进行电子探针显微分析,发现其N元素含量远高于基体,属于N富集造成的局部冶金缺陷。通过对纯钛铸锭的真空电弧熔炼过程进行分析,得出产生该问题的原因为:一是海绵钛里混入TiN颗粒,熔炼时未剔除干净;二是在电极焊接时未采取有效的保护措施,焊接时有大气介质导致N元素含量增加。后期针对上述问题进行改善,有效避免了Gr2纯钛棒材出现此类冶金缺陷。
對用來加工手錶蓋的Gr2純鈦棒材生產過程中髮現的耑麵點狀缺陷進行瞭分析,通過對典型缺陷的顯微組織及硬度進行檢測,髮現缺陷處晶粒更加細小,呈條帶狀,且顯微硬度高于基體;對缺陷區域進行能譜分析,未髮現明顯的成分差異;最後對缺陷區域進行電子探針顯微分析,髮現其N元素含量遠高于基體,屬于N富集造成的跼部冶金缺陷。通過對純鈦鑄錠的真空電弧鎔煉過程進行分析,得齣產生該問題的原因為:一是海綿鈦裏混入TiN顆粒,鎔煉時未剔除榦淨;二是在電極銲接時未採取有效的保護措施,銲接時有大氣介質導緻N元素含量增加。後期針對上述問題進行改善,有效避免瞭Gr2純鈦棒材齣現此類冶金缺陷。
대용래가공수표개적Gr2순태봉재생산과정중발현적단면점상결함진행료분석,통과대전형결함적현미조직급경도진행검측,발현결함처정립경가세소,정조대상,차현미경도고우기체;대결함구역진행능보분석,미발현명현적성분차이;최후대결함구역진행전자탐침현미분석,발현기N원소함량원고우기체,속우N부집조성적국부야금결함。통과대순태주정적진공전호용련과정진행분석,득출산생해문제적원인위:일시해면태리혼입TiN과립,용련시미척제간정;이시재전겁한접시미채취유효적보호조시,한접시유대기개질도치N원소함량증가。후기침대상술문제진행개선,유효피면료Gr2순태봉재출현차류야금결함。
There are point-like defects on the surface of Gr 2 pure titanium rods which are used for producing watch covers.The defects were analyzed by testing microstructure and hardness .The results show that the grains of the defects are strip-like and the size is smaller than that in matrix , and the microhardness is higher than that of matrix . No obvious difference is found between chemical composition of defects and matrix after tested by Energy Dispersive Spectrometer .However , it is found that N element content in defect region is much higher than that in matrix after tested by Electron Probe Micro-analyzer , which means the local metallurgical defects are caused by N enrichment . After analyzing VAR melting process of pure titanium ingot , the reasons of these defects should be as follows .Firstly, there are TiN particles in titanium sponge , which are not been removed before melting .Secondly , effective protection measures are not taken when electrodes welding , and air causes N content increases .Late improvements were taken , and such metallurgy defects of Gr 2 pure titanium rods were averted .