Rolling Affected TZM Alloy Plate Mechanical Properties

Compared before and after rolling TZM alloy plate’s room temperature mechanical properties found fine-grained sintered TZM alloy blank after appropriate deformation the density, strength and toughness have been improved to some extent. The tensile strength is greater than 840MPa and elongation is more than 4%. Besides the grain size is small. In TZM alloy Mo grains have weak bonding force, so under the small strain and lower energy it can easily to form cracking, having brittle fracture. And then after suitable rolling, the grains under pressure processing was elongated to fibrous and mutual effect and coexist with Mo grain, strengthening the binding force between the grains, reducing the sensitivity of the material to crack. Further, the grain has small size, at the same deformation degree the deformation can work in the more grains. Besides, the strain at the grains inside or near the grains is small difference and more uniform, reducing stress concentration, so that the material can withstand greater deformation before fracture. Fine grain size, grain boundary twists and turns is not conducive to crack propagation, so in the fracture process can absorb more energy, improving the elongation, exhibiting good room temperature toughness.

The deformation degree is an important factor influence alloy’s density and mechanical properties. In the rolling process, usually to express the deformation degree by compression ratio, the compression ration includes the overall compression ratio and compression rate pass and they have a great influence on the mechanical properties of the alloy. After rolling, the strength and elongation of TZM alloy will increase with overall compression ratio increase. In addition, when the different compression rate pass can reach to 80% overall compression rate, large compression ratio pass has good mechanical properties. This is mainly because large deformation and deformation speed is conducive to close the internal pores of sintered alloy blank, helping to eliminate and reduce alloy internal defects.

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