Effect of Cooling Time from 800℃ to 500℃ on Phase Transition Behavior and Microstructure of Low Temperature Steel 9Ni

杨秀芝; 华文林; 杨春杰; 董春法

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Effect of Cooling Time from 800℃ to 500℃ on Phase Transition Behavior and Microstructure of Low Temperature Steel 9Ni

更新时间：2026-01-21

- Effect of Cooling Time from 800℃ to 500℃ on Phase Transition Behavior and Microstructure of Low Temperature Steel 9Ni
- Special Steel Vol. 38, Issue 5, Pages: 10-12(2017)
- 作者机构：
  
  湖北理工学院机电学院,黄石,435003
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：19 April 2017，
  
  Online First：08 July 2022，
  
  Published：08 July 2017
- 稿件说明：
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杨秀芝, 华文林, 杨春杰, et al. Effect of Cooling Time from 800℃ to 500℃ on Phase Transition Behavior and Microstructure of Low Temperature Steel 9Ni[J]. Special Steel, 2017, 38(5): 10-12.
DOI：

杨秀芝, 华文林, 杨春杰, et al. Effect of Cooling Time from 800℃ to 500℃ on Phase Transition Behavior and Microstructure of Low Temperature Steel 9Ni[J]. Special Steel, 2017, 38(5): 10-12. DOI：

摘要

利用Gleeble-3500热模拟试验机对9Ni低温钢（/%:0.049C，0.22Si，0.58Mn，0.0006S，0.0029P，9.16Ni，0.020Al，0.003Ti，0.0030N，0.0009O）在800℃冷却至500℃时间-t

8/5

（6~100s）的热循环过程进行了模拟

结合金相法建立了试验钢的SHCCT（模拟热影响区连续冷却转变）曲线。采用光学显微镜和扫描电镜对不同t8/5试样的显微组织进行了观察

研究了冷却时间对原奥氏体晶粒尺寸、M-A组元含量、尺寸、数量和形状因子（M-A组元面密度）的影响。结果表明

模拟热影响区连续冷却试样的显微组织由贝氏体（B）和马氏体（M）组成

其相对含量取决于冷却时间t

8/5

随800℃至500℃(t

8/5

)冷却时间的增加原奥氏体晶粒尺寸

粒状贝氏体含量、M-A组元尺寸增加

同时M-A组元含量和面密度降低

有利于改进9Ni钢粗晶热影响区的低温韧性。

Abstract

The simulation on circulation process of heat of low temperature steel 9Ni (/% : 0.049C

0.22Si

0.58Mn

0.0006S

0.0029P

9.16Ni

0.020Al

0.003Ti

0.0030N

0.0006O) with different cooling time (6-100 s) from 800 °C cooling to 500 ℃(t

8/5

) has been carried out by using Gleeble-3500 simulator

and combined with metallography the simulated heat affected zone continuous cooling transformation (SHCCT) curves of tested steel are established. The structure in tested specimen with different cooling time of t

8/5

is observed by optical and scanning electron microscope to study the effect of cooling time on original austenite grain size

M-A group area

size

number and shape factor (rati

o of massive M-A). Results show that the structure of simulated heat affected zone of continuous cooling specimen consists of bainite (B) and martensite (M)

the relative content of M depends on cooling time of t

8/5

with increasing cooling time from 800 °C to 500℃ (t

8/5

) the original austenite grain size

particle bainite content and M-A group size increase while the M-A group content and ratio of massive M-A decrease

it is available to improve the low temperature toughness of coarse grain heat affected zone of steel 9Ni.

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