Abstract
This study carried out the evaluation and comparison the microstructure and tensile properties of elbow, which is manufactured by the cold and hot forming using STS304L. Hot-formed specimen shows the austenite single-phase, while the cold-formed specimen shows some martensite in austenite structure. Heat treated elbows after the cold- and the hot-forming also show the austenite single-phase. It is well known that the martensite produced by cold forming is inverse transformation into austenite by heat treatment. The cold formed specimen shows higher strength but lower elongation than hot-forming specimen. This is a cause of transformation of some austenite into martensite, dislocation, and precipitate generated during cold-forming. The strength of the cold-formed elbow increased by about 15% and the elongation decreased by about 38%, whereas the hot-formed elbow had no significant change in strength and elongation.
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