Study on Structure and Performance of Coarse Grained Heat Affected Zone( CGHAZ) of Machinery Steel 960QT

刘旭辉; 张波; 肖爱达; 欧玲; 郝春晖

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Study on Structure and Performance of Coarse Grained Heat Affected Zone( CGHAZ) of Machinery Steel 960QT

更新时间：2026-01-21

- Study on Structure and Performance of Coarse Grained Heat Affected Zone( CGHAZ) of Machinery Steel 960QT
- Special Steel Vol. 40, Issue 1, Pages: 63-67(2019)
- 作者机构：
  
  1. 东北大学轧制技术及连轧自动化国家重点实验室，沈阳4,H000
  2. 湖南华菱涟源钢铁有限公司技术中心,娄底,417009
  3. 湖南工业大学冶金与材料工程学院,株洲,412000
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：08 August 2018，
  
  Online First：24 May 2022，
  
  Published：24 May 2019
- 稿件说明：
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刘旭辉, 张波, 肖爱达, et al. Study on Structure and Performance of Coarse Grained Heat Affected Zone( CGHAZ) of Machinery Steel 960QT[J]. Special Steel, 2019, 40(1): 63-67.
DOI：

刘旭辉, 张波, 肖爱达, et al. Study on Structure and Performance of Coarse Grained Heat Affected Zone( CGHAZ) of Machinery Steel 960QT[J]. Special Steel, 2019, 40(1): 63-67. DOI：

摘要

采用热模拟技术研究了960QT高强钢不同t8/5条件下热影响区粗晶区（CGHAZ）的组织和性能

获得热影响区连续冷却转变曲线。得到的结果为:t

8/5

在3～6s

硬度值变化不大

CGHAZ组织为板条马氏体。t

8/5

=10 s

可见板条贝氏体

随着t8/5的增加

组织中板条贝氏体逐渐增加

而板条马氏体逐渐减少

CGHAZ显微硬度逐渐降低。当t

8/5

达到150 s后

组织中出现粒状贝氏体

显微硬度进一步降低。当t8/5> 600 s后

显微组织以粒状贝氏体为主。利用实测热影响区t

8/5

数据

建立了960QT钢t

8/5

值与线能量（E）的关系式。t

8/5

为30 s时

粗晶区显微硬度（325 HV1）与母材相当（330 HV1）。焊接时应控制热输入

使t

8/5

小于30 s

不预热条件下线能量应小于1.4kJ/mm。

Abstract

The microstructure and property of the coarse grained heat affected zone( CGHAZ) of 960QT steel was studied under t

8/5

by using thermal simulation technology

and the continuous cooling transformation curve of the heat affected zone(SH-CCT diagram)was acquired. The results show that

the microstructure of the CGHAZ consists of lath martensite and the hardness values change little as t

8/5

is 3 - 6 s. When t

8/5

= 10 s

lath bainite appears. With increase of t

8/5

the lath martensite reduces and lath bainite increases

and the microhardness of CGHAZ gradually reduct. When t

8/5

reaches 150 s

granular bainite in structure is found the microhardness is further reduced. As t

8/5

> 600 s

the CGHAZ mainly consists of granular bainite. Based on the measured heat affected zone 5

the relationship between tg/5 values and heat input E of steel 960QT is established. As t

8/5

is 30 s

the microhardness of CGHAZ (325 HV1) is equal to the base metal(330 HV1). So the heat input should be controlled to ensure that t

8/5

is less than 30 s. Under non-preheating conditions

the heat input should be less than 1.4 kj/mm.

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