摘要
This paper deals with structure and impact energy of weld HAZ of 10CrNi3MoV steel after secondary weld thermal cycle (t_ 8/5 =8 s ～120 s ; peak temperature T_ m =750 ℃ ～1 300 ℃ ). It is demonstrated that the coarse grain and structure produced by first thermal cycle keep unchanged after secondary thermal cycle above Ac_ 1 critical temperature but below 1 050 ℃ . At the same time the low temperature impact energy decreases obviously with increasing t_ 8/5 . By metallurgical microscope and transmission electron microscope(TEM) , it is revealed that the effect of coarse grain and structure caused by secondary thermal cycle on low temperature impact energy.
This paper deals with structure and impact energy of weld HAZ of 10CrNi3MoV steel after secondary weld thermal cycle (t_ 8/5 =8 s ～120 s ; peak temperature T_ m =750 ℃ ～1 300 ℃ ). It is demonstrated that the coarse grain and structure produced by first thermal cycle keep unchanged after secondary thermal cycle above Ac_ 1 critical temperature but below 1 050 ℃ . At the same time the low temperature impact energy decreases obviously with increasing t_ 8/5 . By metallurgical microscope and transmission electron microscope(TEM) , it is revealed that the effect of coarse grain and structure caused by secondary thermal cycle on low temperature impact energy.
