The Effect of Recrystallization on Creep Properties of Alloy IN939 Fabricated by Selective Laser Melting Process

蠕动 材料科学 选择性激光熔化 高温合金 再结晶(地质) 合金 晶界 位错 延伸率 复合材料 微观结构 冶金 极限抗拉强度 生物 古生物学
作者
Santhosh Banoth,Chenwei Li,Yo Hiratsuka,Koji Kakehi
出处
期刊:Metals [MDPI AG]
卷期号:10 (8): 1016-1016 被引量:26
标识
DOI:10.3390/met10081016
摘要

In this research, we studied the creep properties of a selective laser melting (SLM)-processed γ′-strengthened IN939 superalloy along the building direction compared to a conventional cast alloy as a reference specimen. In the as-built condition, high-density dislocations were formed as a result of the SLM process due to the generation of the larger thermal gradient. Post-heat treatment was necessary to obtain specific mechanical properties to match industrial requirements. Two heat treatment conditions were used: the first was lower temperature heat treatment (LTH: solution treatment at 1160 °C/4 h + aging at 850 °C/16 h). The second was higher temperature heat treatment (HTH: solution treatment at 1240 °C/6 h + aging at 850 °C/16 h). Creep tests were conducted at 816 °C/250 MPa. The first and second heat treatment conditions were used for the SLM specimens, but only the first condition was used for the cast alloy (cast-LTH). The SLM specimens in the as-built and LTH conditions showed very poor creep life but good elongation. The poor creep life of the as-built specimen was caused by high dislocation density and the small recrystallized grains formed during testing. In the LTH specimen, poor creep life was due to the formation of the undesirable η phase at the grain boundary, as well as the formation of small recrystallized grains during testing. The creep life of the HTH specimen was 2.7 times longer compared to the LTH specimen. This was because these specimens were covered with recrystallized grains that included low-density dislocations, columnar grain morphology with random orientation, improvement in γ′ precipitate size, and elimination of undesirable η phase. The cast LTH specimen showed longer creep life than SLM specimens because of coarser grains with low-density dislocations, γ′ precipitate coarsening during the creep, and the presence of carbides at grain boundaries. In addition, the cast LTH specimen exhibited lower creep strain rate than SLM specimens also helped in creep life improvement.
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
大幅提高文件上传限制,最高150M (2024-4-1)

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
无忧应助庾储采纳,获得10
刚刚
刚刚
冷酷幻灵发布了新的文献求助10
1秒前
ttt完成签到,获得积分10
1秒前
1秒前
2秒前
3秒前
3秒前
思源应助正直无极采纳,获得10
4秒前
塔恩沃特发布了新的文献求助10
5秒前
5秒前
6秒前
Rdeohio发布了新的文献求助10
6秒前
6秒前
Jasper应助孤独擎采纳,获得10
7秒前
Dannerys完成签到 ,获得积分10
7秒前
7秒前
小小小鸟完成签到,获得积分10
8秒前
汉堡包应助卡乐瑞咩吹可采纳,获得10
8秒前
bqin发布了新的文献求助10
9秒前
大海完成签到,获得积分10
9秒前
10秒前
BGI789完成签到,获得积分10
10秒前
辛勤太阳完成签到,获得积分10
10秒前
小沈小沈发布了新的文献求助10
10秒前
humengxiao完成签到,获得积分10
11秒前
11秒前
思源应助独特酸奶采纳,获得10
13秒前
芍药完成签到 ,获得积分10
15秒前
超级小飞侠关注了科研通微信公众号
16秒前
芊芊钱钱发布了新的文献求助10
16秒前
鱼鱼鱼完成签到 ,获得积分20
17秒前
18秒前
团结友爱完成签到,获得积分10
18秒前
脑洞疼应助科研小白采纳,获得10
20秒前
21秒前
21秒前
Yvette2024完成签到,获得积分10
21秒前
SPLjoker完成签到,获得积分10
22秒前
wbb发布了新的文献求助30
23秒前
高分求助中
Sustainability in ’Tides Chemistry 2000
Sustainability in ’Tides Chemistry 1500
The ACS Guide to Scholarly Communication 1000
TM 5-855-1(Fundamentals of protective design for conventional weapons) 1000
Ethnicities: Media, Health, and Coping 800
Historia de la ciencia jurídica europea 600
Treatise on Geomorphology(2nd Edition - March 1, 2022) 520
热门求助领域 (近24小时)
化学 医学 生物 材料科学 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 基因 遗传学 催化作用 物理化学 免疫学 量子力学 细胞生物学
热门帖子
关注 科研通微信公众号,转发送积分 3070024
求助须知:如何正确求助?哪些是违规求助? 2724039
关于积分的说明 7483616
捐赠科研通 2371113
什么是DOI,文献DOI怎么找? 1257302
科研通“疑难数据库(出版商)”最低求助积分说明 609889
版权声明 596879