Study on the Microstructure and Properties of TIG Additive Manufacturing N50 Stainless Steel

WANG Dongbo; ZHANG Haiyan; WANG Xu; YANG Wei; WEI Wei; NI Junjie; HUANG Zhiquan

doi:10.7512/j.issn.1001-2303.2024.11.13

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Study on the Microstructure and Properties of TIG Additive Manufacturing N50 Stainless Steel
Vol. 54, Issue 11, Pages: 99-104(2024)
Published： 25 November 2024 ，
DOI： 10.7512/j.issn.1001-2303.2024.11.13
稿件说明：

移动端阅览

王东波，张海燕，王旭，等.TIG增材N50不锈钢组织与性能研究［J］.电焊机，2024，54（11）：99-104.

WANG Dongbo, ZHANG Haiyan, WANG Xu, et al.Study on the Microstructure and Properties of TIG Additive Manufacturing N50 Stainless Steel[J].Electric Welding Machine, 2024, 54(11): 99-104.
王东波，张海燕，王旭，等.TIG增材N50不锈钢组织与性能研究［J］.电焊机，2024，54（11）：99-104. DOI： 10.7512/j.issn.1001-2303.2024.11.13.

WANG Dongbo, ZHANG Haiyan, WANG Xu, et al.Study on the Microstructure and Properties of TIG Additive Manufacturing N50 Stainless Steel[J].Electric Welding Machine, 2024, 54(11): 99-104. DOI： 10.7512/j.issn.1001-2303.2024.11.13.

摘要

为解决N50制造成本居高不下，且传统减材加工方式的材料利用率低的问题。采用加工速度快、材料利用率高的TIG电弧增材制造技术制备N50不锈钢，并研究不同增材高度下增材体的显微组织、夹杂物分布、显微硬度和77 K力学性能。研究发现，TIG增材技术能制造出完全由奥氏体晶粒组成的N50不锈钢，增材体的77 K屈服强度、抗拉强度及断后伸长率随高度增加而降低，显微硬度也逐渐降低。分析表明，增材体高度的增加影响冷却速度和夹杂物的分布，上层冷却速度降低导致上层枝晶间距较大，且上层夹杂物尺寸和数量均多于下层，这些因素共同影响了材料的低温塑韧性。

Abstract

To solve the problem of high manufacturing costs and low material utilization rate of traditional subtractive processing methods for N50. This study adopts TIG (Tungsten Inert Gas) arc additive manufacturing technology

which offers fast processing speed and high material utilization

to fabricate N50 stainless steel. It investigates the microstructure

inclusion distribution

microhardness

and mechanical properties at 77 K of the additive body at different heights. The research found that TIG additive technology can produce N50 stainless steel composed entirely of austenite grains. The yield strength

tensile strength

and elongation after fracture at 77 K of the additive body decrease with increasing height

and the microhardness also gradually decreases. Analysis indicates that the increase in the height of the additive body affects the cooling rate and distribution of inclusions. The upper layers experience a slower cooling rate

resulting in larger dendritic arm spacings

and both the size and quantity of inclusions in the upper layers are greater than those in the lower layers. These factors collectively influence the low-temperature toughness and malleability of the material.

关键词

电弧增材制造N50不锈钢低温力学性能枝晶间距夹杂物

Keywords

arc additive manufacturingN50 stainless steelcryogenic mechanical propertiesdendrite spacing

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