A novel microstructural design and heat treatment technique based on gradient control of carbon partitioning between austenite and martensite for high strength steels

作     者：WANG FengYing ZHU YueFeng ZHOU HuiHua JIANG BoZhi WANG Guan 

作者机构：Key Laboratory for Advanced Materials Processing TechnologyMinistry of EducationChinaDepartment of Mechanical EngineeringTsinghua University Department of Materials Science and EngineeringTsinghua University 

基　　金：supported by the National Basic Research Program of China (973 program) (Grant No. 2010CB630805) 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2013年第56卷第8期

页      码：1847-1857页

摘      要：Based on gradient control of carbon partitioning between martensite and austenite during heat treatment of steels,a stepping-quenching-partitioning(S-Q-P) process is developed for high strength *** S-Q-P process involves several quenching processes at progressively lower temperatures between martensite-start(Ms) and martensite-finish(Mf) temperatures,each followed by a partitioning treatment at either the initial quenching temperature or above that temperature.A novel microstructure is designed based on the S-Q-P *** and distributions of retained austenite and high-carbon martensite surrounded by martensite laths can be manipulated by the partitioning duration and temperature,and quenching temperature of the S-Q-P *** element Si is employed in the S-Q-P steel to suppress formation of carbides and create suitable amount of retained austenite.A steel of 0.39C-1.22Mn-1.12Si-0.23Cr(wt.%) treated by the S-Q-P process is endowed with some special microstructural characteristics:some strips of retained austenite located at edges of martensite blocks with high density of dislocations and between martensite laths,some small blocks of twinned martensites distributed among bundles of the low-carbon martensite *** mechanical properties of the medium carbon steel after the S-Q-P process can reach ultimate tensile strength(Rm) of 1240 MPa,total elongation(EI) of 25%,and product of strength and ductility(PSD) of 31.2 GPa% that are much more improved than those after the conventional quenching-tempering(Q-T) and currently prevailing quenching-partitioning(Q-P) *** PSD of the tested steel after the S-Q-P process increases by 67% and 32% as compared with those after the Q-T and Q-P processes,respectively.

主 题 词：高碳马氏体 微观结构设计 高强度钢 梯度控制 奥氏体钢 分割处理 热处理工艺 残留奥氏体 

学科分类：0810[工学-土木类] 080503[080503] 08[工学] 0805[工学-能源动力学] 0802[工学-机械学] 0702[理学-物理学类] 0812[工学-测绘类] 080201[080201] 

核心收录：

D　O　I：10.1007/s11431-013-5206-5

馆 藏 号：203848750...