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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructural Effects on the Mechanical Integrity of a TRIP-800 Steel Welded by Laser-CO_2 Process
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Microstructural Effects on the Mechanical Integrity of a TRIP-800 Steel Welded by Laser-CO_2 Process

机译：显微组织对激光CO_2焊接TRIP-800钢机械完整性的影响

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摘要

In this study, a TRIP-800 steel was welded using a Laser CO_2 process, and the resultant microstructures were characterized by optical, scanning, and transmission electron microscopy (TEM) means. It was found that the microstructure of the steel in the as-received condition consisted of ferrite, bainite, and retained austenite (RA), including some martensite. In particular, TEM observations indicated that the developed martensites were high carbon twinned martensites. It was found that laser beam welding (LBW) promoted the development of up to 23% martensite in the fusion zone (FZ) and up to 30% in the heat-affected zone (HAZ). In addition, determinations of RA using x-ray diffraction indicated that the amount of RA developed in the FZ was relatively small (< 6%). Confirmation for the relatively large amounts of martensite in both the FZ and HAZ was indirectly made by the shape of microhardness profiles, which resembled a "top hat." Tensile testing in welded strips indicated a loss of strength and ductility. An examination of the fracture surfaces indicated that the steel fractured in a brittle fashion at the HAZ-BM interface. Apparently, the development of relatively large amounts of martensite in the HAZ reduced the steel toughness. In turn, this indicated that LBW leads to martensite embrittlement in the HAZ regions, but not at the parting line of the FZ.
机译：在这项研究中，使用激光CO_2工艺焊接了TRIP-800钢，并通过光学，扫描和透射电子显微镜（TEM）手段对所得的显微组织进行了表征。已发现，在接收状态下，钢的显微组织由铁素体，贝氏体和残余奥氏体（RA），包括一些马氏体组成。尤其是，TEM观察表明，发达的马氏体是高碳孪晶马氏体。发现激光束焊接（LBW）促进了熔化区（FZ）高达23％的马氏体的发展，而热影响区（HAZ）则高达30％的马氏体的发展。此外，使用X射线衍射测定RA的结果表明，在FZ中显影的RA量相对较小（<6％）。 FZ和HAZ中马氏体中相对大量的确认是通过显微硬度轮廓的形状间接确定的，该形状类似于“礼帽”。焊接条的拉伸试验表明强度和延展性下降。对断裂表面的检查表明，钢在HAZ-BM界面处以脆性断裂。显然，热影响区中大量马氏体的发展降低了钢的韧性。反过来，这表明LBW会在HAZ区域导致马氏体脆化，而在FZ的分型线上却不会。

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