工程科学学报2018，Vol.40Issue(1)：76-83,8.DOI:10.13374/j.issn2095-9389.2018.01.010
基于应变控制的4Cr5MoSiV1热作模具钢热机械疲劳行为
Strain-controlled thermal-mechanical fatigue behavior of 4 Cr5 MoSiV1 hot work die steel
摘要
Abstract
In-phase (IP) and out-of-phase (OP) thermal-mechanical fatigue (TMF) tests of 4Cr5MoSiV1 hot work die steel were conducted in full reverse mechanical strain control in the temperature range of 400-700℃ by a TMF servo-hydraulic testing system (MTS?). The results indicate that, when the strain amplitude is ±0. 50％, the OP TMF life of 4Cr5MoSiV1 steel is ～60％ of the IP TMF life. The stress-strain hysteresis loops show asymmetries for both IP and OP loading. IP loading leads to comprehensive mean stress, while OP loading gives rise to tensile mean stress in the temperature range of 400-700℃. The changes of maximum strain and peak temperature with maximum stress are inconsistent, and the stress relaxation phenomenon could be observed under IP and OP load-ing. Moreover, two kinds of TMF cycling exhibite continuous cyclic softening in the high temperature half stage, while in the low tem-perature half stage, cyclic hardening occurs initially and is then followed by continuous cyclic softening. The fractured surfaces under IP TMF loading display striation and tear ridge, and exhibits quasi-cleavage characteristics. In addition, the cracks are less but longer. However, fractured surfaces under OP TMF loading mainly display striation and dimple characteristics, and the cracks are shorter and more abundant.关键词
热作模具钢/热机械疲劳/应变控制/应力应变行为/疲劳断口Key words
hot work die steel/thermal-mechanical fatigue/strain control/stress and strain behavior/fatigue fracture分类
矿业与冶金引用本文复制引用
左鹏鹏,吴晓春,曾艳,何西娟..基于应变控制的4Cr5MoSiV1热作模具钢热机械疲劳行为[J].工程科学学报,2018,40(1):76-83,8.基金项目
国家重点研发计划资助项目(2016YFB0300400,2016YFB0300404) （2016YFB0300400,2016YFB0300404）
