SDP2新型贝氏体塑料模具钢连续冷却相变与力学性能研究

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英文篇名：Study on Continuous Cooling Transformation and Mechanical Properties of SDP2 New Bainite Plastic Die Steel 作者：张铮 ; 吴晓春 英文作者：ZHANG Zheng;WU Xiaochu;School of Materials Science and Engineering, Taiyuan University of Technology;School of Materials Science and Engineering, Shanghai University; 关键词：塑料模具钢 ; 冷却速度 ; 贝氏体 英文关键词：plastic mould steel;;cooling rate;;bainite 中文刊名：SJGY 英文刊名：Hot Working Technology 机构：太原理工大学材料科学与工程学院;上海大学材料科学与工程学院; 出版日期：2019-05-25 07:03 出版单位：热加工工艺 年：2019 期：v.48;No.512 语种：中文; 页：SJGY201910064 页数：4 CN：10 ISSN：61-1133/TG 分类号：249-251+254

摘要

为满足大截面塑料模具钢需求,通过计算机模拟得到SDP2钢大模块锻后风冷条件下的冷速区间,以此为依据采用相变仪进行连续冷却试验,研究了冷速低至0.01℃/s时新型贝氏体塑料模具钢SDP2的相变特性与力学性能。结果显示,SDP2新型贝氏体钢的临界冷速为0.015℃/s。当冷速低于0.02℃/s、贝氏体开始转变温度升高至400℃左右,中温区相变产物以下贝氏体为主;560℃回火,SDP2钢硬度为31～34 HRC,抗拉强度为1081 MPa,冲击功达到33 J。因此,SDP2钢的力学性能满足大模块生产要求。
        In order to meet the requirement of large section plastic die steel, the cooling rate range of SDP2 steel large module during air cooling after forging is obtained by computer simulation. On the basis of this, the continuous cooling test was carried out with a phase changer. The phase-change characteristics and mechanical properties of a new type of bainite plastic die steel SDP2 with cooling rate as low as 0.01℃/s were studied. The results show that, the critical cooling rate of SDP2 new bainitic steel is 0.015 ℃/s. When the cooling rate is lower than 0.02 ℃/s, the transformation temperature of bainite rises to about 400℃, and the trans formation product during the intermediate temperature region is mainly lower bainite.When tempering at 560 ℃, the hardness of SDP2 steel is 31-34 HRC, the tensile strength is 1081 MPa, and the impact work is33 J. Therefore, the mechanical properties of SDP2 steel meet the requirements of large module production.

引文

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