NGHIÊN CỨU CƠ CHẾ HÌNH THÀNH VẾT NỨT TRÊN CHI TIẾT HỢP KIM INCONEL 625 CHẾ TẠO BỞI CÔNG NGHỆ DLMD

0 Người đánh giá. Xếp hạng trung bình 0

Tác giả: Tat Khoa Doan, Van Nguy Duong, Van Van Le, Tai Hoai Thanh Nguyen, Quang Hung Trinh

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học & Công nghệ - Trường Đại học Công nghiệp Hà Nội, 2023

Mô tả vật lý: tr.54

Bộ sưu tập: Metadata

ID: 364238

Thêm vào giỏ Liên kết toàn văn

ABSTRACT Direct Laser Metal Deposition (DLMD) is one of the contemporary forming technologies with significant potential for application across critical industries. This technology proves its worth in the manufacture of intricate components from challenging materials, such as nickel alloys and titanium alloys... DLMD represents a complex process, where the structural and mechanical properties of the formed material are heavily reliant on technological factors. Crucially, the assessment of defects residing within the deposition layers emerges as a focal yardstick, commanding current research endeavors. This paper investigates the influence of energy density within the molten region on crack formation within the deposition layers of Inconel 625 nickel alloy formed using DLMD technology. Results show that lower energy densities lead to poor adhesion between the forming layers and the substrate material, thereby initiating cracks within the deposition layer. The outcomes of the analysis unveil the existence of clusters comprised of aluminum oxide and titanium oxide within the fissures. These clusters stand as contributory agents to the diminished cohesion between the deposition layers, ultimately instigating the emergence of cracks at locations where these oxide aggregates reside. Subsequently, these cracks propagate along the paths delineated by crystalline structures, traversing through the deposition layers.DLMD là một trong những công nghệ tạo hình hiện đại, có tiềm năng ứng dụng rất lớn trong các ngành công nghiệp trọng điểm. Công nghệ này được sử dụng để chế tạo những chi tiết từ các vật liệu khó gia công như hợp kim niken, hợp kim titan... DLMD là một quá trình phức tạp, tổ chức và cơ tính vật liệu tạo hình phụ thuộc rất lớn vào các yếu tố công nghệ. Khuyết tật trong lớp tạo hình là một trong những chỉ tiêu chất lượng quan trọng đang được các nhà khoa học quan tâm. Bài báo này nghiên cứu ảnh hưởng của mật độ năng lượng vùng nóng chảy đến sự hình thành vết nứt trong lớp tạo hình hợp kim niken Inconel 625 tạo hình bằng công nghệ DLMD. Kết quả nghiên cứu cho thấy, khi mật độ năng lượng thấp sẽ dẫn đến sự không liên kết giữa lớp tạo hình vơi vật liệu nền, hình thành vết nứt trên lớp tạo hình. Kết quả phân tích cho thấy sự tồn tại của các ô xít nhôm, ô xít titan trong các vết nứt, đây là một trong những nguyên nhân gây nên liên kết yếu giữa các lớp tạo hình, vết nứt được hình thành tại các vị trí có ô xít và phát triển dọc theo các tinh thể, xuyên qua các lớp tạo hình.

1. Đọc trực tuyến

1. Đọc trực tuyến

Tạo bộ sưu tập với mã QR