在1100℃和应变速率5×10~(-2)s~(-1)条件下对Cr25Ti铁素体钢进行热变形模拟试验,有动态再结晶发生.在变形早期有少部分晶界形核,随后均匀形核.较强的动态回复促使形成大量完好亚晶,变形诱发亚晶转动和亚晶界合并形成新晶粒.观察到原晶粒中的亚晶不断倾转弯曲或扭转形成再结晶晶粒间的位向关系.这表明此合金动态再结晶的形核方式与某些矿物类似,主要以应变诱发亚晶逐渐转动而均匀形核.这种较大程度的不同时性形核,使动态再结晶的应力峰不明显.
The hot deformation behaviour and microstructure change of a Cr25 Tiferritic stainless steel under compression at strain rate 5×10~(-2)s~(-1) and 1100℃ byusing formaster press have been studied. It is observed that in the early stage, theminor fine grains were found along the original grain boundaries, and under thefurther increasing strain, the intragranular nucleation became more predominate.The stronger dynamic recovery results in a lot of well-defined subgrains. The strainwill induce the subgrain rotation together with the subboundary coalescence andform new grains. An observation also revealed that lattice orientation betweendynamic recrystallization grains is formed from the progressing rotation in "tilt"or "torsion" of subgrain in the original grains. It seems that the dynamic recrys-tallization nucleation of Cr25Ti steel is similar to several minerals in that bothare nucleated homogeneously by the strain inducing progressing rotation of sub-grains. However, a high degree of "asynchronism" during dynamic recrystallizationcauses no obvious peak on the stress-strain plot.
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