X80M管线钢奥氏体晶粒粗化及Nb/Ti的固溶析出行为

研究了一种X80M管线钢在不同奥氏体化温度下,奥氏体晶粒的长大规律以及Nb、Ti的固溶析出行为。研究结果表明,随着奥氏体化温度的升高,Nb、Ti的固溶量逐渐增加。1120～1150℃时,奥氏体晶粒细小均匀且增加缓慢;1165℃时,局部奥氏体晶粒发生粗化现象;1180℃时,奥氏体平均晶粒尺寸显著增大,且出现明显不均匀现象;1195～1210℃时,奥氏体晶粒不均匀现象更明显,晶粒更加粗大。

取向硅钢中含铜抑制剂的固溶析出行为

含铜抑制剂作为取向硅钢的主抑制剂或辅助抑制剂不仅可以抑制初次晶粒的长大,促进二次再结晶,还可以降低铸坯的加热温度。取向硅钢中主要抑制剂为10～50 nm Cu_2S,在钢的铸坯、热轧、冷轧、脱碳等工艺过程均可析出;(Cu,Mn)_(1.8)S、Cu_(1.8)S、ε-Cu等主要作为辅助抑制剂,尺寸一般为30～50 nm(或大于50 nm),主要在热轧阶段析出。总结了国内外有关取向硅钢中含铜抑制剂析出行为的研究进展,当前主要研究不同生产流程和工序中含铜抑制剂的析出行为和作用机理。

高磁感取向硅钢(Hi-B)中AlN抑制剂的固溶析出行为

AlN主要作为Hi-B钢生产的抑制剂来抑制初次晶粒的长大,促进二次再结晶。本文分析总结了国内外对Hi-B钢中AlN抑制剂固溶析出行为的研究工作,并提出了进一步研究的方向。

As-cast Ti_(x)(AlVCr)_(100−x)light-weight medium entropy alloys with high strength and uniform compressive plasticity

The effect of Ti content on the microstructure and mechanical properties of as-cast light-weight Ti_(x)(AlVCr)_(100−x)medium entropy alloys was studied by compressive tests,X-ray diffraction,scanning electron microscopy and transmission electron microscopy.The results suggest that yield strength increases and then decreases with the increment of Ti content.The Ti_(60)(AlVCr)_(40)alloy has the best combination of high strength of 1204 MPa and uniform plastic strain of 70%,possessing a high specific yield strength of 255 MPa·cm^(3)/g.The enhancement of strength is mainly attributed to the synergic effects of solid-solution and coherent nano-precipitation strengthening,while dislocation motion such as dislocation pinning,entanglement and dislocation cells significantly increases the strain-hardening capacity.