EBSD study of early fractured phenomena in a 350 grade Maraging steel elbows exposed to hydrofluoric acid

被引：30

作者：

Masoumi, Mohammad ^{[1
]}

Abreu, Hamilton F. G. ^{[2
]}

Herculano, Luiz F. G. ^{[2
]}

Pardal, Juan M. ^{[3
]}

Tavares, Sergio S. M. ^{[4
]}

Silva, Marcelo J. G. ^{[2
]}

机构：

[1] Univ Fed ABC, Ctr Engn Modelagem & Ciencias Socials Aplicadas, Av Estados 5001, BR-09210580 Santo Andre, SP, Brazil

[2] Univ Fed Ceara, Ctr Tecnol, Dept Engn Met & Mat, Fortaleza, Ceara, Brazil

[3] Univ Fed Fluminense, Programa Posgrad Engn Mecan PGMEC & Montagem Ind, Rua Passo Patria 156, BR-24210240 Niteroi, RJ, Brazil

[4] Ctr Fed Educ Celso Suckow, Programa Posgrad Engn Mecan & Tecnol Mat, Rio De Janeiro, RJ, Brazil

来源：

ENGINEERING FAILURE ANALYSIS | 2019年 / 104卷

基金：

巴西圣保罗研究基金会;

关键词：

350 Maraging steel; EBSD; Kernel average misorientation; Taylor factor; HIGH-STRENGTH; RETAINED AUSTENITE; CRACK-PROPAGATION; TEXTURE; DIFFRACTION; MARTENSITE; STABILITY; EVOLUTION;

D O I：

10.1016/j.engfailanal.2019.05.031

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The effect of grain orientations, boundary characteristics, and crystal effects on the crack formation of a 350 high strength Maraging steel elbows exposed to hydrofluoric acid was investigated in the present research. Tempered low tetragonal martensite and fresh martensite were characterized by scanning electron microcopy. Moreover, no segregation zone and precipitates were found near the crack path. Detail analyzing the spatial distribution of crystal orientations by electron backscattered diffraction technique revealed the development of two soft and hard grains. Soft grains oriented approximately along {110} planes provide adequate slip systems to promote dislocation mobility, indicating as low Taylor factor grains distributed well the strain gradient. However, hard grains associated with low compact {001} planes decrease dislocation mobility and increasing the strain accumulation. Micro-cracks initiation and propagation along these high internal energy grains are expected consequently.

引用

页码：379 / 387

页数：9

共 40 条

[1]

[Anonymous], 1966, JOM1

[2] Effect of crystal orientation and texture on fatigue crack evolution in high strength steel welds [J].