A Study on Continuous Cooling Transformation of ø170 mm Hot-Rolled Products of Non-Quenching-and-Tempering Steel C38N2

文成; 蒋波; 杨忠; 王海龙; 刘雅政

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A Study on Continuous Cooling Transformation of ø170 mm Hot-Rolled Products of Non-Quenching-and-Tempering Steel C38N2

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- A Study on Continuous Cooling Transformation of ø170 mm Hot-Rolled Products of Non-Quenching-and-Tempering Steel C38N2
- Special Steel Vol. 35, Issue 1, Pages: 57-60(2014)
- 作者机构：
  
  1. 北京科技大学材料科学与工程学院,北京,100083
  2. 西宁特殊钢集团有限责任公司,西宁,810005
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：07 August 2013，
  
  Online First：06 September 2022，
  
  Published：06 September 2014
- 稿件说明：
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文成, 蒋波, 杨忠, et al. A Study on Continuous Cooling Transformation of ø170 mm Hot-Rolled Products of Non-Quenching-and-Tempering Steel C38N2[J]. Special Steel, 2014, 35(1): 57-60.
DOI：

文成, 蒋波, 杨忠, et al. A Study on Continuous Cooling Transformation of ø170 mm Hot-Rolled Products of Non-Quenching-and-Tempering Steel C38N2[J]. Special Steel, 2014, 35(1): 57-60. DOI：

摘要

采用热膨胀法和金相法

通过Gleeble-1500热模拟试验机试验研究了非调质钢C38N2(/%:0.38C

0.55Si

1.42Mn

0.011P

0.047S

0.03Nb

0.015Ti

0.022Al

0.020N)在冷却速度0.5~20℃/s时的动态(950℃

变形速率5 s

-1

50%变形

冷却至室温)和静态(未变形

880℃冷却至室温)的连续冷却转变(CCT)曲线。结果表明

未变形时非调质钢C38N2当冷却速度0.5℃/s时为铁素体-珠光体组织

3.0℃/s时为贝氏体+铁素体-珠光体组织

›3.0~11℃/s时为贝氏体+马氏体组织

15℃/s时为马氏体组织;当冷却速度≤11℃/s时动态CCT的相变开始温度均大于静态CCT相变开始温度。

Abstract

The dynamic (deforming 50% at 950 °C with deformation rate 5 s

-1

cooling to ambient) and static (nondeforming

880 °C

cooling to ambient) continuous cooling transformation (CCT) curves with cooling rate 0. 5 ~20 °C/s of non-quenching-and-tempering steel C38N2 (/%: 0. 38C

0. 55Si

1.42Mn

0. 011P

0. 047S

0. 03Nb

0. 015Ti

0. 022Al

0. 020N) have been tested and studied with using Gleeble-1500 thermal simulation machine by thermal expansion dilation method and metallographic examination. Results show that for non-deforming steel

with cooling rate 0. 5 °C/s

the structure of non-quenching-and-tempering steel C38N2 is ferrite-pearlite

as cooling rate is 3. 0 °C/s its structure is bainite + ferrite-pearlite

with cooling rate >3. 0 ~ 11 °C/s the steel has bainite + martensite structure and

with 15 ^C/s the structure of steel is martensite； as cooling rate ≤11℃/s

all the phase transformation initial temperature of dynamic CCT is larger than that of static CCT.

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