Iron-based alloy powder material for plasma cladding quick forming

Abstract

The invention discloses an iron-based alloy powder material for plasma cladding quick forming, which comprises the following alloy components in percentage by weight: 0.05-0.15 percent of C, 4-8 percent of Ni,10-15 percent of Cr, 0.1-1 percent of B, 0.8-1.2 percent of Si, 0.8-1.2 percent of Mo, 0.25-0.70 percent of Nb, 0.25-3.5 percent of mixed RE(containing 47 percent of Ce, 26 percent of La,18 percent of Nd and 5 percent of Pr in percentage by mass) and the balance of Fe. The iron-based alloy powder with the components is especially suitable for plasma cladding quick forming, and a cladding layer has medium hardness and wear-resistance. The iron-based alloy powder has little tendency to crack and other cladding defects under the condition of multi-layer cladding, and the cladding process is excellent with low powder cost. The powder can be also used for restoring work-piece size or used as a bottom layer before a functional cladding layer is formed during plasma single-layer cladding repair, and can be applied to wider application needs.

Description

technical field [0001] The invention relates to an iron-based alloy powder, in particular to a special iron-based alloy powder for plasma cladding rapid forming. Background technique [0002] Plasma powder cladding process is a low-cost direct metal rapid prototyping method, which has become a research hotspot in the field of direct metal rapid prototyping. So far, plasma cladding alloy powders for direct metal rapid prototyping often use thermal spraying powders and alloy powders for surfacing welding. High B and Si content, it is easy to form brittle phases such as FeB to precipitate and gather at the grain boundary to cause cracks, and the low melting point borosilicate generated when Si and B deoxidize when forming a thick cladding layer remains in the cladding layer , easy to form a liquid film during the cooling process of the cladding layer, resulting in crystallization cracks. [0003] Alloys in the prior art generally have the following types of structures, (1) pu...

AI Technical Summary

Problems solved by technology

So far, plasma cladding alloy powders for direct metal rapid prototyping often use thermal spraying powders and alloy powders for surfacing welding. High B and Si content, it is easy to form brittle phases such as FeB and gather at the grain boundary to cause cracks, and the low melting point borosilicate generated when Si and B deoxidize when forming a thick cladding layer remains in the cladding layer , easy to form a liquid film during the cooling process of the cladding layer, resulting in crystallization cracks

When there is a martensite structure in the cladding layer, during the solidification process of the cladding layer, the phase transformation stress will be generated due to the martensitic transformation, which will deteriorate the stress state of the cladding layer, resulting in an increase in crack sensitivity. Although the phase austenite structure has good toughness, its thermal expansion coefficient is higher than that of other types of structures. In the case of multi-layer cladding, the cladding layer will crack due to the accumulation of thermal stress

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