工程科学学报2016，Vol.38Issue(11)：1559-1568,10.DOI:10.13374/j.issn2095-9389.2016.11.008
Al对热挤压模具钢 SDAH13连续冷却转变规律的影响
Effect of Al on the continuous cooling transformation characteristic of hot extrusion die steel SDAH13
摘要
Abstract
The continuous cooling transformation ( CCT) diagrams of SDAH13 hot extrusion die steels with different mass fractions of Al (0. 77% and 1. 43%) and without Al were measured by dilatometry. The effects of Al on the CCT diagrams, microstructure and hardness of SDAH13 steels were studied by optical microscopy, scanning electron microscopy ( SEM) and Vickers hardness test. The results show that the phase transformation temperature points ( Ac1 , Ac3 and Ms) of SDAH13 steels significantly increase, the contents of retained austenite in the quenched steels decrease, and theα-γmulti-phase region expands with the increase in mass fraction of Al. However, when austenited at 1060℃, Al has no obvious influence on the critical cooling rate (0. 30℃·s-1 ) of bainite transforma-tion, but bainite phase region broadens. Meanwhile, the critical cooling rates of pearlite transformation of SDAH13 steels with the Al content of 0. 77% and 1. 43% are 0. 05℃·s-1 and 0. 3℃·s-1, respectively, which are higher than the critical cooling rate (0. 02℃·s-1 ) of pearlite transformation of SDAH13 steel without Al. Pro-eutectoid ferrite appears at the cooling rate from 0. 02℃·s-1 to 0. 08℃·s-1 when the mass fraction of Al reaches 1. 43%. Nevertheless, the quenched hardness decreases with Al addition.关键词
模具钢/热挤压/铝元素/相变点/连续冷却转变Key words
die steels/hot extrusion/aluminum/phase transformations points/continuous cooling transformation分类
矿业与冶金引用本文复制引用
盛振栋,左鹏鹏,吴晓春..Al对热挤压模具钢 SDAH13连续冷却转变规律的影响[J].工程科学学报,2016,38(11):1559-1568,10.基金项目
国家科技支撑计划资助项目(2007BAE51B04) （2007BAE51B04）
