Damage indicators for early fatigue damage assessment in WC-Co hardmetals under uniaxial cyclic loads at a stress ratio of R = −1 at elevated temperatures

材料科学 循环应力 微观结构 电子背散射衍射 磁滞 压力(语言学) 扫描电子显微镜 复合材料 拉伤 冶金 凝聚态物理 语言学 医学 物理 内科学 哲学
作者
Kathrin Maier,Thomas Klünsner,Philip Pichler,S. Marsoner,Werner Ecker,Christoph Czettl,Jonathan Schäfer,R. Ebner
出处
期刊:International Journal of Refractory Metals & Hard Materials [Elsevier BV]
卷期号:103: 105749-105749 被引量:8
标识
DOI:10.1016/j.ijrmhm.2021.105749
摘要

WC-Co hardmetals are utilized as tool materials in metal cutting applications in which they are exposed to high mechanical cyclic loads and elevated temperatures. A better understanding of the failure mechanisms of WC-Co hardmetals under these application conditions and the ability to diagnose the damage evolution state are key factors to understand the limits of endurable cyclic load at a certain temperature. The aim of the current work was the experimental determination of stress-strain-hysteresis loops for the investigation of damage indicators in uniaxial cyclic tests at a stress ratio of R = σmin/σmax = −1 for two WC-10 wt% Co hardmetals at 700 °C and 800 °C in vacuum. An increase in the stress-strain-hysteresis loop area and tension-compression-strain asymmetry was recorded with increasing number of load cycles at 800 °C, with earlier failure than at 700 °C. The relationship between the stress-strain-hysteresis loop parameters and the damage evolution state at the microstructure level, as well as the deformation behavior of WC- and Co-phases with increasing number of load cycles, were analyzed. To this end, the microstructure for one WC-Co hardmetal grade was analyzed by scanning electron microscopy and electron backscatter diffraction after cyclic testing up to defined numbers of load cycles at 800 °C. It was observed that the hysteresis loop area and strain asymmetry coincide with the formation of nanopores at WC/WC interfaces and WC/Co phase boundaries, which enlarge to form larger cavities with increasing number of load cycles. Additionally, electron backscatter diffraction data showed that the fcc Co-phase partially transformed into hcp Co under cyclic loading. All specimens, in which an increase in the stress-strain hysteresis loop area or strain asymmetry was observed, ultimately failed when a sufficiently high number of load cycles was applied. Thus, these results indicate that the investigated parameters are reliable indicators for bulk material damage.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
汤飞柏发布了新的文献求助10
刚刚
答辩科学家完成签到,获得积分10
刚刚
中旬日完成签到,获得积分10
刚刚
znn发布了新的文献求助10
1秒前
1秒前
2秒前
Jiro完成签到,获得积分10
2秒前
无奈行恶应助嗯哼采纳,获得20
3秒前
杜小宝完成签到,获得积分20
3秒前
3秒前
4秒前
yw完成签到,获得积分10
4秒前
4秒前
5秒前
SciGPT应助yao chen采纳,获得10
5秒前
李爱国应助innate采纳,获得10
6秒前
6秒前
6秒前
7秒前
7秒前
LXD发布了新的文献求助10
7秒前
iNk应助两只老虎和兔子采纳,获得10
7秒前
fuyue完成签到,获得积分10
8秒前
8秒前
8秒前
8秒前
华仔应助高木同学采纳,获得10
8秒前
狂野萤应助耍酷的觅荷采纳,获得20
8秒前
czyzyzy发布了新的文献求助10
9秒前
lucas发布了新的文献求助10
9秒前
musejie应助陈琳采纳,获得10
9秒前
1112完成签到,获得积分10
9秒前
刘医生发布了新的文献求助30
9秒前
gx发布了新的文献求助10
9秒前
梦想在飞发布了新的文献求助20
10秒前
10秒前
Orma完成签到 ,获得积分10
11秒前
11秒前
安静人完成签到 ,获得积分10
12秒前
高lucky发布了新的文献求助10
12秒前
高分求助中
Picture Books with Same-sex Parented Families: Unintentional Censorship 700
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
Effective Learning and Mental Wellbeing 300
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3974797
求助须知:如何正确求助?哪些是违规求助? 3519250
关于积分的说明 11197623
捐赠科研通 3255405
什么是DOI,文献DOI怎么找? 1797769
邀请新用户注册赠送积分活动 877156
科研通“疑难数据库(出版商)”最低求助积分说明 806202