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唐正柱, 陈佩寅, 吴伟. Nb对镍基合金高温失塑裂纹敏感性的影响机理[J]. 焊接学报, 2008, (1): 109-112.
引用本文: 唐正柱, 陈佩寅, 吴伟. Nb对镍基合金高温失塑裂纹敏感性的影响机理[J]. 焊接学报, 2008, (1): 109-112.
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TANG Zhengzhu, CHEN Peiyin, WU Wei. Effect of niobium on ductility drop cracking susceptibility of nickel-base alloys[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2008, (1): 109-112.
Citation: TANG Zhengzhu, CHEN Peiyin, WU Wei. Effect of niobium on ductility drop cracking susceptibility of nickel-base alloys[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2008, (1): 109-112.
shu

Nb对镍基合金高温失塑裂纹敏感性的影响机理

Effect of niobium on ductility drop cracking susceptibility of nickel-base alloys

    摘要
  • 摘要: 通过应变—裂纹(STF)试验法测定临界开裂应变值和开裂温度,确定HS690焊丝中Nb含量对熔敷金属抗高温失塑裂纹(DDC)能力的影响规律,并采用透射电镜对焊丝熔敷金属中析出物的尺寸和形态进行了观察。结果表明,在焊接工艺条件相同的情况下,采用向HS690焊丝中添加Nb的冶金方法能够调整晶界处第二相(Nb,Ti)C的数量和形态,晶界条件得到改善,HS690熔敷金属抗DDC的能力得到明显的提高。

     

    Abstract: The strain-to-fracture was used to determine the strain threshold and temperature which cause cracking and quantify the DDC(ductility dip cracking)susceptibility of HS690 filler metals which have different content of Nb.The morphology and distribution of precipitation was analyzed by trasmission electron microscope.The results show that adding Nb to HS690 filler metal will improve the quantity and morphology of the second phase(Nb, Ti)C in grain boundaries, the condition of grain boundaries and DDC susceptibility of HS690 filler metal.

     

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