机械注塑模毕业设计外文文献翻译A comparative study on non-quenched and quenched prehardened steel for large section plastic mould

本资料包含pdf文件1个，下载需要1积分

机械注塑模毕业设计外文文献翻译A comparative study on non-quenched and quenched prehardened steel for large
section plastic mould
Luo Yi
∗，Wu Xiao-chun，Wang Hong-bin， Min Yong-an
School of Material Science and Engineering， Shanghai University， Shanghai 200072， China
article info
Article history:
Received 23 August 2007
Received in revised form 14 April 2009
Accepted 18 April 2009
Keywords:
Non-quenched prehardened steel
Quenched prehardened steel
Plastic mould steel
Microstructures
CCT diagram
Properties
abstract
The non-quenched prehardened (NQP) steel and quenched and tempered prehardened (QP) steel for
plastic mould were compared in terms of their microstructures， machinability， hardness and weldability
along with their continuous cooling transformation. Results show that the microstructure of the NQP
steel bloom consists of bainite through the whole section， while tempered martensite and bainite are
found across the whole section of the QP steel. However， hardness fluctuations of two types of steel are
not more than 3 HRC， for the former contributed to the high bainitic hardenability， while， for the latter，
microstructureswere adjusted by heat treatment after forging. Comparedwith the QP steel， the NQP steel
results in better machinability， weldability and requires a simplified process that saves energy.
© 2009 Elsevier B.V. All rights reserved.
1. Introduction
The intensive increase in the production and consumption of
plastics makes ever-increasing demands on plastic mould steel.
al.， 2007) or show quenching cracks when used for large sections
(Song et al.， 2004). Therefore， by modifying the chemical composi-
tion， SP300 steel (Corre et al.， 1999)， B series steel (Jiang andWang，
1999)， 2738mod.TS steel (Vetter and Hippenstiel， 2006)， Toolox 33