Question

机械专业英语翻译（请不要用机器翻译）

Effects of heat treatment process and niobium addition
on the microstructure and mechanical properties
of low carbon steel weld metal
Shanping Lu•Shitong Wei•Dianzhong Li•
Yiyi Li
Received: 16 April 2009/Accepted: 2 January 2010/Published online: 20 January 2010
? Springer Science+Business Media, LLC 2010
Abstract
The mechanical properties and microstructure
were evaluated and analyzed by optical microscopy (OM)
and transmission electron microscopy (TEM) for micro-
alloy carbon steel weld metal with and without Nb addi-
tion, respectively, under different heat treatment processes
including stress relief annealing, normalizing, and no
treatment after welding. The strength and elongation of the
weld metal without treatment after welding were improved
with the addition of Nb element, and the impact toughness
was not affected obviously with the Nb addition. After
stress relief annealing, the strength decreased for the
Nb-free weld metal, while the elongation and impact
toughness increased. However, for the Nb-bearing weld
metal, stress relief annealing improved the strength of the
weld metal significantly, and deteriorated the elongation
and impact toughness. In the case of normalizing treat-
ment to the weld metal, it was shown that with the
increase of the holding time at the normalizing tempera-
ture of 920 ?C, for both the weld metals with and without
Nb addition, the microstructure of the columnar grain zone
(CGZ) was transformed from one of columnar grain into
one of equiaxed grain. The grain size of the equiaxed grain
zone (EGZ) increased initially, then remained almost
unchanged with the prolonging of the holding time. The
mechanical properties of the weld metal with and without
Nb addition showed no obvious change with the increas-
ing holding time. With the increase of the normalizing
temperature, the strength of the Nb-bearing weld metal
increased, while the elongation and impact toughness
decreased significantly. OM and TEM analysis found that
the fine NbC particles were precipitated at the normalizing
temperature of 920 ?C, which refined the grains of the
weld metal and increased the impact toughness. With the
increase of the normalizing temperature, the content of
widmanstatten ferrite (WF) in the Nb-bearing weld metal
increased, whereas the quantity of the NbC particles
decreased, which improved the strength and lowered the
impact toughness.

Answer 1

影响热处理工艺和铌的添加
对钢的组织和力学性能
低碳钢焊缝金属
扇平卢•世卫•滇中李•
李依依
四月：16收到2009 / 2010 / 2接受：一月在线发表：一月20 2010
？施普林格科学+商业媒体公司，2010
摘要
力学性能和微观结构
进行了评价和分析，光学显微镜（唵）
和透射电子显微镜（透射电镜）微—
碳合金钢焊缝金属和无铌阿迪—
，分别，在不同的热处理工艺
包括消除应力退火，正火，没有
焊后热处理。强度和伸长率的
无焊后焊缝金属进行了改进
除了铌元素，和冲击韧性
没有明显的影响，随着加入。后
消除应力退火，强度下降的
nb-free焊缝金属，而延伸率和冲击
增加韧性。然而，对于含铌焊缝
金属，消除应力退火改善的力量
焊缝金属，和恶化的伸长
冲击韧性。在案件的规范化治疗—
对焊缝金属，结果表明，与
保温时间的增加，在正常温度—
真正的920？三，对焊缝金属和无
注：另外，微观结构的柱状晶区
（一般管道除湿机）是从一个柱状晶粒为
一轴晶。晶粒尺寸的等轴晶
区（大悦）增加最初，几乎保持
不变的延长保温时间。本
力学性能的焊缝金属和无
加入变化不明显的增加—
在保持时间。随正火
温度，强度的含铌的焊缝金属
增加，而断裂伸长率和冲击韧性
显着下降。光学显微镜和透射电子显微镜分析发现
细颗粒沉淀在全国广播公司的规范
温度920？三，其中精制谷物的
焊缝金属的冲击韧性提高。提供的
增加正火温度，内容
魏氏铁素体（工作流）的含铌的焊缝金属
增加的数量，而美国粒子
降低，提高了强度和降低
冲击韧性。

Answer 2

你还敢再懒一点吗，整篇都放上来了

追问

这不是整篇，只是第一段