本文系统地研究了起始γ晶粒尺寸约800μm,含碳量分别为0.10,0.25,0.39,0.71％的四种碳素钢在试验温度700—1300℃,变形速率6.7×10~(-4)—6.7×10~(-2)S~(-1)下的拉伸变形行为。着重指明:由热激活过程决定的γ相区的变形方程符合(?)=Aσ_M~nexp(-Q/RT);γ相区最大变形应力随含碳量的增加而下降;在(α+γ)二相区稍低于A_3温度出现脆化;二相区的脆化随含碳量的增加而趋缓和。
A systematical study was made of the tensile deformation behaviour of 4 different carbon steels, containing 0.10, 0.25, 0.39 and 0.71% C respectively, with initial austenite grain size 800μm under temperature 700—1300℃ at the strain rate 6.7×10~(-4)—6.7×10~(-2)S~(-1). It was indicated that the equation of deformation in the region of austenite phase controlled by the heat activation process is quite agreed with (?)=Aσ_M~nexp(-Q/RT) and the maximum deformation stress is decreased with the increasing of their C content. In the binary phase α+γ region, an embrittlement appears under temperature slightly lower than A_3 point and may become more or less to toughen as the increase of the C content.
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