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利用Gleeble-3500热/力模拟试验机研究了高温形变对E36船板钢高温奥氏体和随后γ→α相变的影响。结果表明,高温形变使高温奥氏体晶粒拉长,有效晶界面积Sv增加。高温形变促进γ→α相变,在740、880℃变形之后,在700℃保温1 s即可有铁素体出现,而未变形时700℃保温300 s才出现铁素体,使铁素体转变孕育期缩短两个数量级。而且材料经变形后明显细化铁素体晶粒,在740℃变形,真应变为0.36变形条件下铁素体晶粒尺寸可达到7.89μm,晶粒细化效果明显。
The effect of high temperature deformation on high temperature austenite and subsequent γ → α phase transformation of E36 ship steel was studied by Gleeble-3500 thermal / force simulation test machine. The results show that high temperature deformation causes the high temperature austenite grains to elongate and the effective grain boundary area Sv increases. High temperature deformation promotes γ → α phase transformation. After deformation at 740 and 880 ° C, ferrite appears at 700 ° C for 1 s, and ferrite does not appear until 300 ° C at 700 ° C without deformation, Change the incubation period shortened two orders of magnitude. Moreover, the ferrite grains are obviously refined after deformation, and the deformation of the ferrite grains at 740 ℃ is true strain of 0.36, the grain size of ferrite can reach 7.89μm, and the grain refinement effect is obvious.