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| MICROHARDNESS INVESTIGATION OF 0Cr18Ni10Ti STAINLESS STEEL WELDED JOINT |
| XU Ze-Jian; |
| 西北工业大学航空学院 |
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Cite this article:
XU Ze-Jian. MICROHARDNESS INVESTIGATION OF 0Cr18Ni10Ti STAINLESS STEEL WELDED JOINT. Acta Metall Sin, 2008, 44(5): 636-640 .
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Abstract Vicker’s microhardness tester equipped with diamond pyramid indenter was used to carry out microhardness tests on 0Cr18Ni10Ti stainless steel welded joint. Indentaion size effects (ISE) of different regions at the joint, including the weld metal (WM), base metal (BM), fusion zone (FZ) and heat-affected zone (HAZ) were studied at loads varying from 10 to 500 g for a constant dwell time of 10 s. The results show that the microhardness for each region of the welded joint decreases with the increasing load at comparatively low loads, and then tends to invariable as the indentation load exceeds 200 g. The PSR model was adopted to accurately describe the variation of the hardness as a function of indentation test load. The error between the tested hardness at 200 g of applied load and the calculated value using this model is less than 3%. Indentation tests were also successively performed across the welded joint to evaluate the distribution of the microhardness for different regions of the welded joint and optical microstructures are observed and analyzed. The yield stress distribution of the welded joint was also calculated according to its relationship with the hardness.
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Received: 22 October 2007
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