Automotive Mass Reduction with Martensitic Stainless Steel

Codd, Daniel S.

doi:10.4271/2011-01-0427

Cited by 16 publications

(11 citation statements)

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“…5 Martensitic stainless steels (MSSs) are ideally suited for structural components and assemblies, satisfying the requirements of high strength, toughness and corrosion resistance with ease of forming in the annealed state. 1 Martensitic stainless steels are seldom welded because of their high hardenability, 6 and the formation of brittle untempered martensite in fusion zone (FZ) and heat affected zone (HAZ), regardless of the prior condition of the steel. 1 Thus, martensitic stainless steels are considered to be the most difficult of the five stainless steel families to weld.…”

Section: Introductionmentioning

confidence: 99%

“…1 Martensitic stainless steels are seldom welded because of their high hardenability, 6 and the formation of brittle untempered martensite in fusion zone (FZ) and heat affected zone (HAZ), regardless of the prior condition of the steel. 1 Thus, martensitic stainless steels are considered to be the most difficult of the five stainless steel families to weld. 7 Whereas resistance spot welding (RSW) is the main sheets joining method in automotive industry, 8,9 surveys in RSW of MSSs are limited.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure–properties relationships in martensitic stainless steel resistance spot welds

Alizadeh-Sh

Marashi

Pouranvari

2014

Science and Technology of Welding and Joining

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The paper addresses the phase transformations and mechanical response of martensitic stainless steel resistance spot welds. The fusion zone microstructure consists of carbon-rich martensite together with a relatively high amount of retained delta ferrite along the grain boundaries with a transition in solidification mode from equiaxed to columnar dendritic grains across the fusion zone. The heat affected zone microstructure is featured by martensitic matrix together with carbide precipitation. The very high hardness of the fusion zone and the heat affected zone, the sharpness of the notch at sheet/sheet interface, which is located in the hard microstructural zone, and the presence of delta ferrite in the weld nugget play important roles in failure characteristics and mechanical performance of the joint.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure–properties relationships in martensitic stainless steel resistance spot welds

Alizadeh-Sh

Marashi

Pouranvari

2014

Science and Technology of Welding and Joining

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“…Stainless steel can be used in door pillars including A and B pillar reinforcement parts, bumper beams, rollover bars, crash boxes, suspension/wheel housings and subframes. [4][5][6] Under impact, high strength austenitic and duplex stainless steels (DSSs) offer excellent energy absorption in relation to strain rate. Therefore, they are ideal for the revolutionary 'space frame' car body structure concept.…”

Section: Introductionmentioning

confidence: 99%

Welding metallurgy of stainless steels during resistance spot welding Part I: fusion zone

Pouranvari

Alizadeh-Sh

Marashi

2015

Science and Technology of Welding and Joining

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Weldability is one of the key requirements for automotive materials. This two-part paper aims at understanding the metallurgical phenomena during resistance spot welding of stainless steels, as interesting candidates for automotive body in white. Part I addresses the phase transformations in the fusion zone of three types of stainless steels including austenitic, ferritic and duplex types. The solidification and solid state phenomena including columnar to equiaxed transition, ferriteaustenite post-solidification transformation, martensitic transformation and carbide precipitation are discussed. Particular attention is given to the effect of high cooling rate of resistance spot welding process on the ferrite-austenite transformation. Key factors controlling the hardness of the fusion zone are highlighted.

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“…[ 13 ] Independently, the potential of MSSs for cold‐forming applications has already been proven with the cold forming of diverse automotive parts. [ 14 ] Cold forming has several advantages compared to hot forming. It is energy efficient and allows for high precision, high‐quality surface finishes, and high‐speed production.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Feasibility of Cold Forming of Automotive Parts from Quenched and Partitioned Martensitic Stainless Steels

Pablos

Sierra-Soraluce

Sabirov

et al. 2023

steel research int.

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Sheet metal forming is among the most widely employed processes in manufacturing. Its economic feasibility relies on many factors, including the mechanical properties of the processed materials, energy efficiency of the metalforming processes and quality of the manufactured parts. This work focuses on developing a computational approach to assess the mechanical behavior of Quenched and Partitioned (QP) Martensitic Stainless Steels (MSSs) undergoing cold forming, aiming at the serial production of automotive parts. The Johnson‐Cook (J‐C) constitutive model and Forming Limit Diagram (FLD) are derived and validated for each alloy using the experimental data from tensile and Nakajima tests. From the simulated FLD, a theoretical Forming Limit Stress Diagram (FLSD) is calculated. The latter is used as a fracture criterion for the cold‐forming process. Cold stamping of two automotive parts, B‐pillar and tunnel, is modeled using the J‐C constitutive model and the FLSD. It is demonstrated that the tunnel can be successfully cold‐formed from all three studied steels. In contrast, extensive cracking is expected during the cold forming of the B‐pillar from all materials. It is envisaged that these computational models can be employed for the assessment of any comparable part manufacturing procedure from the QP MSSs.This article is protected by copyright. All rights reserved.

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Automotive Mass Reduction with Martensitic Stainless Steel

Cited by 16 publications

References 1 publication

Microstructure–properties relationships in martensitic stainless steel resistance spot welds

Microstructure–properties relationships in martensitic stainless steel resistance spot welds

Welding metallurgy of stainless steels during resistance spot welding Part I: fusion zone

Assessing the Feasibility of Cold Forming of Automotive Parts from Quenched and Partitioned Martensitic Stainless Steels

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