Research on welding cold crack sensitivity of heat resistant steel 1Cr11Co3W3NiMoVNbNB

ZHANG Junming; XIONG Jiankun; CHEN Daping; XU Shunxin

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Research on welding cold crack sensitivity of heat resistant steel 1Cr11Co3W3NiMoVNbNB
Vol. 49, Issue 4, Pages: 283-286(2019)
Published：2019
DOI：
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DOI：

ZHANG Junming, XIONG Jiankun, CHEN Daping, et al. Research on welding cold crack sensitivity of heat resistant steel 1Cr11Co3W3NiMoVNbNB[J]. Eletric Welding Machine2019, 49(4): 283-286. DOI：

摘要

1Cr11Co3W3NiMoVNbNB为日本进口的新型高强度马氏体耐热钢

与传统的12Cr耐热钢相比

W、Co元素含量增至3%

使得该钢具有更好的高温持久强度和抗蠕变性能

但焊接性差。对1Cr11Co3W3NiMoVNbNB耐热钢的焊接性进行分析研究

并分别进行了斜Y型坡口抗裂试验和插销试验。结果表明

随着预热温度的提高

其斜Y型坡口焊接裂纹率逐渐下降

焊前不预热插销试样断口为沿晶+穿晶断裂形貌

当预热温度达到300℃时

断口为韧性断裂形貌。随着预热温度的升高

该材料的焊接冷裂纹敏感性下降。

Abstract

1Cr11Co3W3NiMoVNbNB imported from Japan for the new high-strength martensitic heat-resistant steel

compared with the traditional 12Cr heat-resistant steel

Co elemental content increased to 3%

making the steel has better high-temperature lasting strength

creep resistance

but the weldability is deteriorated. In this paper

research on the weldability of 1Cr11Co3W3NiMoVNbNB heat-resisting steel

and conducts oblique Y-groove and cold-plug test respectively. The results show that the preheating temperature is increased

the welding crack rate of oblique Y-groove is gradually decreased

and the preheated bolt sample is not preheated to be intergranular and transgranular fracture morphology. When the preheating temperature reaches 300 ℃

the fracture is ductile fracture morphology. As the preheat temperature increases

the material’s cold cracking sensitivity decreases.