Comparison of Sulfide Morphology and Mechanical Properties of As-cast andForged Titanium-Sulfur Containing Free-Cutting Steel

WANG Yinghu; SONG Lingxi

doi:10.11973/jxgccl202102007

Materials and Mechanical Engineering > 2021 > 45(2): 37-42,48. > DOI: 10.11973/jxgccl202102007

WANG Yinghu, SONG Lingxi. Comparison of Sulfide Morphology and Mechanical Properties of As-cast andForged Titanium-Sulfur Containing Free-Cutting Steel[J]. Materials and Mechanical Engineering, 2021, 45(2): 37-42,48. DOI: 10.11973/jxgccl202102007

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Comparison of Sulfide Morphology and Mechanical Properties of As-cast andForged Titanium-Sulfur Containing Free-Cutting Steel

WANG Yinghu^1,2,
SONG Lingxi^1,2

1. Pangang Group Research Institute Co., Ltd., Panzhihua 617000, China;
2. State Key Laboratory of Marine Equipment Made of Metal Material and Application, Anshan 114009, China

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Received Date: March 23, 2020
Revised Date: January 17, 2021

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Abstract

Abstract

Two titanium-sulfur containing free-cutting steels with titanium content (0.09wt% and 0.21wt%) were smelted and forged at 1 200 ℃. The morphology, size and quantity of sulfides in the structure and the mechanical properties of the as-cast and forged test steels were compared and studied. The results show that in the as-cast test steel, most of the manganese sulfides were short-rod-like and spherical, and distributed in chains or nets along the grain boundaries. After forging, the manganese sulfides extended along the forging direction, the statistically obtained length-width ratio increased, and the quantity per unit area decreased. The increase of titanicum content increased the quantity per unit area of manganese sulfides. The tensile fracture surface of the as-cast test steel showed cleavage terrace and river pattern, and the fracture mode was brittle fracture. The tensile fracture after forging showed cleavage and dimple mixed morphology, and the fracture mode was ductile fracture. The tensile properties and the impact toughness of the forged test steel were better than those of the as-cast steel, indicating forging was helpful to improve the mechanical properties of the titanium-sulfur containing free-cutting steel.
- forging,
- titanium-sulfur containing free-cutting steel,
- sulfide morphology,
- mechanical property

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Comparison of Sulfide Morphology and Mechanical Properties of As-cast andForged Titanium-Sulfur Containing Free-Cutting Steel

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