Cracking Phenomena in Welds IV
Cracking Phenomena in Welds IV
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焊缝开裂现象 IV
DOI：
10.1007/978-3-319-28434-7
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
H. Hänninen
中科院分区：
文献类型：
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作者：
J. Andersson;J. Jacobsson;A. Brederholm;H. Hänninen
通过变应变试验，可以评估合金在焊接过程中对热裂的敏感性，当测试板在焊接时弯曲时。因此，焊接施加的应变可以通过弯曲作用施加的应变来增加，从而找到热裂纹出现时的应变极限，以及通过计算单个裂纹的数量和测量长度来区分不同合金的可焊性，从而确定对热裂纹的敏感性。通常建议支架避免铰接，并使用厚度大于10毫米的测试板，以尽量减少压缩应变（弯曲试件的下部）对弯曲处焊缝开裂的影响。两种沉淀硬化镍基高温合金（ati 718Plus®和Haynes®282®）的开裂响应在实际拉伸/压缩比的背景下进行了分析，并通过连接在测试板的上下表面的应变片进行了测量。在变应变试验中发现，压缩应变对开裂响应没有影响。与ATI 718Plus®相比，Haynes®282®的热裂敏感性更低。
By Varestraint testing, the susceptibility of an alloy to hot cracking during welding can be evaluated on test plates when they are bent at the same time as welding takes place. The strains imposed by welding can thus be augmented by the strains imposed by the bending action to find the strain limits when hot cracks appear and also the sensitivity to hot cracking by counting the number and measuring the length of the individual cracks as a means to differentiate between the weldability of different alloys. Supports are usually recommended to avoid hinging and to use test plates thicker than 10 mm in order to minimize the influence of the compression strains (lower part of the bent specimen) on the weld cracking at the bending. The cracking response of two precipitation hardening Nickel-based superalloys—ATI 718Plus®and Haynes®282®—was analysed in the context of the actual tensile/compression ratio imposed and measured by strain gauges attached to the upper and lower surface of the test plates. It was found that no influence of the compressive strains on the cracking response in Varestraint testing takes place. It was also seen that the hot cracking susceptibility of Haynes®282®is lower compared to that of ATI 718Plus®.