中碳钢温变形的力学特性  

Mechanical Characteristics of Warm Deformation of Medium Carbon Steel

作　　者：李志杰[1,2] 彭艳[1,2] 刘宏民[1,2] 王素芬[1,2] 肖力子[1] 

机构地区：[1]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004 [2]燕山大学国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004

出　　处：《北京理工大学学报》2013年第4期425-428,435,共5页Transactions of Beijing Institute of Technology

基　　金：国家科技支撑计划项目(2011BAF15B01);国家教育部新世纪优秀人才支持计划项目(NCET-09-0117);国家科技重大专项项目(2011ZX04002-101);河北省科技计划项目(10212101D);河北省杰出青年科学基金(E2011203002)

摘　　要：利用Gleeble-3500热模拟实验机对中碳钢铁素体+珠光体组织进行温变形压缩试验,研究其在不同变形温度(500～700℃)和应变率(0.001～10s-1)条件下的流变行为及其主导机制.研究结果表明:温变形过程先从铁素体变形开始,而后珠光体开始变形,渗碳体片层结构被破坏;铁素体晶粒细化至1～2μm;珠光体片层被破坏使流变应力形成峰值;温变形流变应力曲线特征具有显著差异性,对工件塑性成形、工模具载荷分布及变形产生重要影响.To study the warm deformation process of medium carbon steel, the compression experiment was conducted using Gleeble-3500 thermal/mechanical simulator system under the conditions of temperature from 500 to 700 ℃ and the strain rate from 0. 001 to 10 s^-1. The experimental results indicate that the deformation process begins from ferrite first, and then the pearlite part, which makes the brokenness of lamellar cementite. Ferrite grain could be refined till 1-2μm. Slice layer destruction give rise to the peak value of flow stress. Results also show that the flow stress curve of warm deformation is significantly different from that of hot deformation. This research could give some meaningful references to analyze warm plastic forming process and improve the manufacturing technology.

关 键 词：中碳钢 温变形 流变应力 热模拟 

分 类 号：TG142.1[一般工业技术—材料科学与工程]