Improve the strength and toughness titanium alloy pump titanium alloy pump

Improve the strength and toughness of titanium carbide process improvement measures

For questions titanium carbide sunrui titanium alloy pump cracks and debris in the welding and use often , according to the previous

experimental results were studied process , improve the strength and toughness of the alloy made ​​to prevent cracks

and debris produce good results , strongly proposed to improve the alloy toughness of process improvement measures

are as follows :

1 ) titanium carbide sintering temperature high manganese steel bonded carbide generally the final sintering

temperature 1420 ℃ more appropriate. Sintering temperature is not too high , the temperature is too high titanium

carbide grains grow faster, and even the loss of the binder phase becomes liquid metal , so that the hard phase

occurs adjacent to gather and grow , forming a fragmentation source . This is the bond of the hard phase grains in

the previous analysis phase between fewer reasons. Of course, the sintering temperature can not be too low,

otherwise it would burn less alloy .

2 ) when the heating rate during sintering temperature of these alloys sintering heating rate should not fast ,

especially in degumming , restore, and liquid phase sintering of three stages , to strictly control the heating rate

and holding time . Because low degumming stage, compacts forming agent to release stress and suppress evaporation

process , if the heating speed, due to the volatile and too late after forming agent liquefied into steam , so that

compacts have burst or micro-cracking Sunrui titanium coils phenomenon ; at 900 ℃ the above reduction stage , to make compact enough time

off the raw material powder (e.g., Mn2Fe intermediate alloy ) of volatiles and oxygen ; entering the liquid-phase

sintering stage , but also to slow down the rate of heating sufficiently to make the alloy compacts technology .

Sintered steel bonded carbide principle is the principle of wetting , wetting sufficiently liquid so that the solid

phase ( hard phase ) , otherwise the liquid metal Fe, Mn , etc. will precipitate at the surface of compacts and even

loss.

3 ) the degree of vacuum in the furnace sunrui titanium alloy casting into the liquid phase sintering , in addition to the aforementioned

sintering temperature and velocity control , but also to control the degree of vacuum sintering furnace , because of

high degree of vacuum of the liquid metal causes a large volatile , resulting in segregation .