
第
40
卷第
4
期
2 0 1
3
年
4
月
文章编号
:1674-2974(2013)04-0080-07
湖南大学学报(自然科学版)
Journal
of
Hunan University(Natural Sciences)
Vo
l.
40
,
No.
4
Apr.
20
1 3
够
90
低碳微合金钢热变形微观组织演变及加工图祷
向高
1
,
2f
,谭智林1.
2
(1.贵州大学材料与冶金学院,贵州贵阳
550025;2.
贵州省材料结构与强度重点实验室,贵州贵阳
550025)
摘
要:利用
Gleeble-3800
数字控制热/力模拟试验机研究了
Q690
低碳微合金钢在变
形温度
850~
1l
50
.C
,应变这率
O.
01~30
S-I
条件下的高温羊道次压缩变形行为.建立了基
于动态材料模型
(DMM)
的加工图,结合
OM
观察变形体微观组织确定了该铜种的高温热
变形机制.结果表明:应变量
O.
7
及以下的加工图中包含
2
个峰区(1
000~1120
.C
,
O.Ol~
O.
37
S-I
和
1100~1150
.C
,
3.16~30
S-I)
和
3
个加工失稳区
(850~900
.C , 0.
01~0.
32
S-I
和
850~900
.C
,
10~30
S-I
以及
1
000~1
085
.C ,
1~30
S-I).
应变量超过
0.8
的加工围
包含
2
个峰区(1
025~1
100
.C , 0.
01~0.
38
S-I
和
1
100~1
150
.C
,
3~30
s-
吵,失稳区为
低温
(850~900
.C , 0.
01~30
S-I)
以及应变这率
1
S-I
以上的中低温度
(850~1
100
.C)
范
围,在这两个峰区峰值点附近的热变形显微组织为均匀的完全动态再结晶组织,因此,这两
个区域均适合
Q690
钢的热加工变形.
关键词:低碳微合金钢;热变形;动态再结晶
z
加工图
中固分类号
:TGll
1.
7
文献标识码
:A
Microstructure
Evolution and
Processing
Map
of
Thermal
Deformation of Q690
Low
Carbon
Microalloyed Steel
XIANG
Song
1
.
2t
,
TAN
Zhi-lin
1
.
2
(1. School of Materials
and
Meta
l1
urgy, Guizhou Univ , Guiyang
550025
, China;
2.
The
Key
Laboratory
for Mechanical Behavior and Microstructure
of
Materials,Guizhou Province , Guiyang
550025
,China)
Abstract:
The
hot
deformation
behavior
of
Q690
low
carbon
microalloyed
steel
was
studied
with
com-
pression
tests
on
a
Gleeble-3
800
simulator
in
the
temperature
rangefrom
850 .C
to
1150
.C
and
true
strain
rate
from
0.01
S-I
to
30
S-I.
Based
on
dynamic
materials
model
(DMM)
,
the
processing
map
for
the
Q690
steel
was
obtained
,
and
the
microstructure
characteristics
were
studied
with
optical
microscope.
The
re-
sults
have
shown
that
,
when
the
true
strain
is
less
than
0.7
,
there
are
two
efficiency
dissipative
peak
re-
gions
(1
OOO~
1
120
.C ,
O.
01
~O.
37s-
1
and
1
100~
1
150
.C , 3.
16~30
S-I)
and
three
processing
instabili-
ty
regions(850~900
.C ,
O.
01~0.
32s
一
1
and
850~900
.C ,
10~30s-1
and
1
000~1
085 .C ,
1~30s-l)
in
the
processing
maps.
The
true
strain
is
mòre
than
O.
8 ,
there
are
two
efficiency
dissipative
peak
regions
(1
025~1100.C
,
O.
01~0.
38
S-I
and
1100~1150
.C ,
3~30
s-
勺,
and
the
flow
instability
regions
appear
at
the
temperature
of
850~900
.C
and
the
strain
of
O.
01~30
S-I
,
as
well
as
at
the
temperature
of
850~1
100
特
收稿日期
:2012
… 07
-10
基金项目:国家自然科学基金资助项目
(50901022)
作者简介:向
富(1
979
一)
,男,贵州瓮安人,贵州大学教授
↑通讯联系人
.E-mail:xiangs221@163.com